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[主观题]

Scientists used to explore【31】the surface of the ocean. Now they【32】below the surface, too

. They want to know about the ocean water and the【33】and animal life【34】in the ocean.

In 1934 the scientist William Beebe dived 3 , 000 feet below the surface in a hollow steel ball. In 1935 Auguste Piccard dived 10, 330 feet. In 1960 his son Jean dived to a【35】of 35, 800 feet.

All these early dives were deep. But the divers could not stay down for very long. They had to【36】the surface after a few seconds. Scientists needed to stay down longer to study life below the surface.【37】, they succeeded. Cousteau, a Frenchman, was able to【38】down to a depth of【36】feet for one month and to a depth of 90 feet for a week.

Now scientists are developing even【39】equipment. With this new equipment, men can stay【40】the surface for days or【41】weeks. In 1962 Consteau【42】a research station 35 feet below the surface. Then in 1964 he set up another station on the ocean floor of the Red Sea. This was the first undersea station to operate【43】help from the surface.

Many countries are now studying undersea【44】. The Soviet Union has an undersea laboratory in the Crimean Sea. The United States has a laboratory 50 feet【45】on the ocean floor【46】the Virgin Islands. In 1970 five men lived there for two weeks. Then a【47】of five women scientists stayed in the laboratory.【48】came other teams of men. All were there to explore the ocean depths and【49】plans for the use of its resources. Scientists hope to find enough【50】, vegetable, and animal wealth there to provide food for the whole world.

(31)

A．in

B．to

C．on

D．under

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更多“Scientists used to explore【31】…”相关的问题

第1题

选词填空：The method for making beer has changed over time. Hops （啤酒花)，for example

选词填空：The method for making beer has changed over time. Hops (啤酒花)，for example, which many a modern beerits bitter flavor, are a 26 recent additions to the beverage. Thiswas mentioned in reference to brewing in the ninth century. Now, researchershave found a 27 ingredient in residue (残留物) from 5000-year-old beer brewingequipment. While excavating two pits at a site in thecentral plains of China, scientists discovered pottery fragments from pots,funnels, amphorae, and stoves (stove fragment pictured). The different shapesof the containers 28 theywere used to brew, filter, and store beer—they may be ancient “beer-making tools,” and the earliest 29 evidence of beer brewing in China, the researchers report online today in theProceedings of the National Academy of Sciences.To30 thathypothesis, the team examined the yellowish, dried 31 insidethe vessels. The majority of the grains—about 80%—were from cereal cropslike barley (大麦), andabout 10% were bits of roots, 32 lily,which would have sweetened the brew, the scientists say. Barley was anunexpected find: The crop was domesticated in western Eurasia and didn’t becomea 33 food incentral China until about 2000 years ago, according to the researchers. basedon that timing, they suggest barley may have 34 in theregion not as food, but as 35 material forbeerbrewing.

A) arrived

B) consuming

C) direct

D) exclusively

E) including

F) inform

G) raw

H) reached

I) relatively

J) remains

K) resources

L) staple

M) suggest

N) surprising

O) test

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第2题

Futurists love computers. After all, 40 years ago electronic digital computers didn't exis

t; today microchips (微型集成电路片) as tiny as a baby's fingernail are making all sorts of tasks faster and easier. Surely the future hold still more miracles.

Some of the computer experiments now going inspire imagination of the future. For example, scientists are working in devices that can electronically perform. some sight and hearing functions, which could make easier for the blind and deaf. They are also working on artificial arms and legs that respond to the electric impulses (脉冲) produced by the human brain. Scientists hope that someday a person who has lost an arm could still have near-normal brain control over an artificial arm.

Video games, computerized effects in movies, and real-life training machines now being used by the U. S. Army are causing some people to predict new educational uses for computers. Computers could someday be used to imitate travel to other planets, to explore the ocean floor or to look inside an atom.

Experiment with electronic banking and shopping inspire predictions that these activities will soon be done from home computer terminals (终端) . Cars, too, might be equipped with computers to help drivers find their way around or to communicate with home and office computers.

Many people, including handicapped (残废的) workers with limited ability to move around, already are working at home using computer terminals. Each terminal is connected to a system at a company's main office. Some futurists say the day may come when few people will have to leave home to go to work—they'll just turn on a terminal.

Which of the following would be the most appropriate title for the passage？

A．Futurists and Computers

B．A Look at Future Uses of Computers

C．Computer Experiments

D．Scientists and Computers

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第3题

The making of glass is a very old industry--at least 4,500 years old. Glass has many extra

ordinary qualities and it is frequently being used in new ways.

One of the most interesting new uses for glass is in telephone communication. Scientists have developed glass fibers as thin as human hair, which are designed to can-y light signals. When the light reaches the other end, it is first changed into electrical signals, which are in turn converted into sound messages.

Called light wave communication, the new system was used successfully in an experiment in Chicago in 1997. During the experiment, two glass fibers were able to carry 672 conversations at the same time. The lightwave cable, containing 144 glass fibers, has the capacity to carry 50,000 conversations at the same time.

The lightwave communication system has two important advantages. First, the glass fiber cables are smaller and weigh less than copper. Second, they cost less.

Perhaps it can be said that telephone communication has entered the age of light.

One of the extraordinary qualities of glass is that it can carry ______.

A．sound signals

B．light signals

C．electrical signals

D．any signals

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第4题

根据内容回答下列各题，The home computer industry has been growing rapidly in the United Sta

tes for the last ten years. Computers used to be large, expensive machines that were very difficult to use. But scientists and technicians have been making them smaller and cheaper while at the same time they have been made easier to use. As a result, their popularity has been increasing as more people have been buying computers for their homes and businesses. Computers have been designed to store information and compute problems that are difficult for human beings to work out. Some have voices that speak with the operators. Stores use computers to keep records of their inventories (库存货物) and to send bills to their customers. Offices use computers to copy letters, record business and keep in touch with other offices. People have been using computers in their homes to keep track of the money they spend. One important new use for computers is for entertainment. Many new games have been designed to be played on the computers. People of all ages have been playing these games. People also have been buying home computers to play computer games, watch movies and listen to concerts at home. They have become very popular indeed. Computers used to _______.

A.work rapidly

B.be large and expensive

C.be easy to use

D.be used for fun

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第5题

In July 1989, Dr.Fox and a team of scientists achieved a major scientific breakthrou

gh.Fox discovered the gene (基因) that causes cystic fibrosis (膀胱纤维症) (CF).Many geneticists consider it 's one of the most significantdiscoveries in human genetics.Theresults of Fox work have helped scientists developtests that identify carriers of the CFgene.They hope his research could cure CF.a testhas been developed to identify peoplerrying the cystic fibrosis gene.The test isbased on knowing where the gene is locatedhe CF gene is a recessive gene.Thismeans a person can carry one copy of the gene andstill not be affected by the disease.However if this person has children with anothererson who carries the Cf genethere is a 25 chance that their children will inherit twoopies of the gene and sufferfrom the disease.The test identifies whether pat for cysticrents carrythe defective CF gene.Researchers are also using Fox discovery to find a curefibrosis.They areworking to produce a drug that will change the activity of the Cf geneId alsoattempting to replace the defective gene with one that functions properly.Itdifficultto produce a drug that changes the Cf gene but does not affect the 100000thergenes of human.But Fox discovery has at least given a chance for the cure othe CF

1.A person with () of a harmful recessive gene will be affected

A.one copy

B two opies

C.no copies

D three copies.

2.We can find answers to the following questions in the passage except ()

A.Do people with CF live longer than they did in the past.

B Describeused to treat CF

C.Evaluate the current methods used to treat CF

D.Describe the drugs used to treat CF

3.The following statements are true except ()

A Only one quarter of people will have chance to have the disease.

B.Fox discovery help scientist develop tests that identify carriers of the CF gene

C.Scientist has already produced a drug to CF

D.To produce a drug is not easy because it should changes the CF gene but notaffectothers

4.The word “recessive” (line 6) probably means ()

A.hidden

B concealing

C.faint

D covered

5.The best title for the passage would be ()

A.Why People Have CF

B.The Drugs Used to Treat CF

C.The Methods of Curing CF

D.TheSignificance of the DiscoveryCystic Fibrosis Gene

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第6题

完成下列各题 C The home computer industry has been growi

ng rapidly in the United States for the last ten years．Computers used to be large and expensive which were very difficult to use．But scientists and technicians have been making them smaller and cheaper while at the same time they have been made easier to use．As a result．their popularity has been increasing as more people have been buying computers for their homes and business．Computers have been designed to store information and computer problems that are difficult for human beings to work out．Some have voice that speak with the operators．Stores use computers to keep records of their inventories(存货清单)and to send bills to their customers．Offices use computers to copy letters，record business and keep in touch with other offices．People have been using computers in their homes to keep track of their money they spend． One important new use for computers is for entertainment．Many new games have been designed to be played on the computers．People of all ages have been playing these games．People also have been buying home computers to play computer games．Watch movies and listen to concert at home．They have become very popular indeed． Computer used to________．

A.work rapidly

B.be large and expensive

C.be easy to use

D.be used for fun

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第7题

Night of the Living Ants When an ant dies，other ants move the dead insect out of the nest．

Night of the Living Ants

When an ant dies，other ants move the dead insect out of the nest．This behavior. is interesting to scientists，who wonder how ants know for sure-and so soon-that another ant is dead．

Dong-Hwan Choe，a scientist at the University of California，found that Argentine ants have a chemical on the outside of their bodies that signals to other ants，“I’m dead-take me away．”

But there's a twist to Choe's discovery．Choe says that the living ants-not just the dead ones -have this death chemical．In other words，while an ant crawls around，perhaps in a picnic or home，it's telling other ants that it's dead．

What keeps ants from hauling away the living dead？Choe found that Argentine ants have two additional chemicals on their bodies，and these tell nearby ants something like，“Wait-I'm not dead yet．” So Choe's research turned up two sets of chemical signals in ants：one says，“I'm dead，”the other set says，“I'm not dead yet．”

Other scientists have tried to figure out how ants know when another ant is dead．If an ant is knocked unconscious，other ants leave it alone until it wakes up．That means ants know that unmoving ants can still be alive．

Choe suspects that when an Argentine ant dies．the chemical that says“Wait-I'm not dead yet” quickly goes away．Once that chemical is gone，only the one that says“I'm dead”is left．“It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard(墓地)，not because its body releases new，unique chemicals after death，”said Choe．When other ants detect the“dead”chemical without the“not dead yet”chemical，they haul away the body．This was Choe's hypothesis(假设)．

To test his hypothesis，Choe and his team put different chemicals on Argentine ant pupae(蛹)． When the scientists used the“I'm dead”chemical，other ants quickly hauled the treated pupae away． When the scientists used the“Wait-I'm not dead yet”chemical，other ants left the treated pupae alone． Choe believes this behavior. shows that the“not dead yet”chemical overrides(优胜于)the“dead”chemical when picked up by adult ants．And that when an ant dies，the“not dead yet”chemical fades away． Other nearby ants then detect the remaining“dead”chemical and remove the body from the nest．

The phrase“this death chemical”in paragraph 3 refers to

A．the chemical that contains poison．

B．the chemical that announces death．

C．the chemical that prevents death．

D．the chemical that causes death．

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第8题

Night of the Living Ants When an ant dies，other ants move the dead insect out of the nest．

Night of the Living Ants

When an ant dies，other ants move the dead insect out of the nest．This behavior. is interesting to scientists，who wonder how ants know for sure-and so soon-that another ant is dead．

Dong-Hwan Choe，a scientist at the University of California，found that Argentine ants have a chemical on the outside of their bodies that signals to other ants，“I’m dead-take me away．”

But there's a twist to Choe's discovery．Choe says that the living ants-not just the dead ones -have this death chemical．In other words，while an ant crawls around，perhaps in a picnic or home，it's telling other ants that it's dead．

What keeps ants from hauling away the living dead？Choe found that Argentine ants have two additional chemicals on their bodies，and these tell nearby ants something like，“Wait-I'm not dead yet．” So Choe's research turned up two sets of chemical signals in ants：one says，“I'm dead，”the other set says，“I'm not dead yet．”

Other scientists have tried to figure out how ants know when another ant is dead．If an ant is knocked unconscious，other ants leave it alone until it wakes up．That means ants know that unmoving ants can still be alive．

Choe suspects that when an Argentine ant dies．the chemical that says“Wait-I'm not dead yet” quickly goes away．Once that chemical is gone，only the one that says“I'm dead”is left．“It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard(墓地)，not because its body releases new，unique chemicals after death，”said Choe．When other ants detect the“dead”chemical without the“not dead yet”chemical，they haul away the body．This was Choe's hypothesis(假设)．

To test his hypothesis，Choe and his team put different chemicals on Argentine ant pupae(蛹)． When the scientists used the“I'm dead”chemical，other ants quickly hauled the treated pupae away． When the scientists used the“Wait-I'm not dead yet”chemical，other ants left the treated pupae alone． Choe believes this behavior. shows that the“not dead yet”chemical overrides(优胜于)the“dead”chemical when picked up by adult ants．And that when an ant dies，the“not dead yet”chemical fades away． Other nearby ants then detect the remaining“dead”chemical and remove the body from the nest．

The phrase“this death chemical”in paragraph 3 refers to

A．the chemical that contains poison．

B．the chemical that announces death．

C．the chemical that prevents death．

D．the chemical that causes death．

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第9题

Futurists love computers. After all,40 years ago electronic digital computers didn't exist

; today microchips as tiny as a baby's fingernail are making all sorts of tasks faster and easier. Surely the future holds still more miracles.

Some of the computer experiments now going on inspire exciting visions of the future. For example, scientists are working on devices that can electronically perform. some sight and hearing functions, which could make life easier for the blind and deaf. They're also working on artificial arms and legs that respond to the electric impulses produced by the human brain. Scientists hope that some day a person who's lost an arm could still have near-normal brain control over an artificial arm.

Video games, computerized special effects in movies, and real-life training machines now being used by the US Army are causing some people to predict new educational uses for computers. Computers could some day be used to simulate travel to other planets, to explore the ocean floor, or to look inside an atom.

Experiments with electronic banking and shopping inspire predictions that these activities will soon be done from home computer terminals. Cars, too, might be equipped with computers to help drivers find their way around (Honda has one in an experimental car) or to communicate with home and office computers. Many people, including handicapped workers with limited ability to move around, already are working at home using computer terminals. Each terminal is connected to a system at a company's main office. Some futurists say the day may come when few people will have to leave home to go to work -- they'll just turn on a terminal

A growing number of factories such as the General Motors Plant in Newark, Delaware, "hire" computerized robots to perform. tasks such as spot welding. Some executives get a gleam in their eyes as they envision the spread of these "perfect workers" -- no coffee breaks, no strikes, and no vacations or sick days.

These modern and potential computer uses are possible because of the silicon microchip.

These chips, which have become increasingly complex since their beginning in 1959, contain a network of information pathways. Electronic impulses travel along the paths. The plans for a chip look much like a city street plan and can be as large as a football field. It can take as long as three months to complete a new chip design. Chips are used to store information, too. An entire "computer" can be put onto one chip -- called a microprocessor.

As chips become even more complex, easier to make, and less costly, futurists predict limitless possibilities. A group of Japanese scientists is working on a new generation of computers, which they hope will be able to understand vocal instructions, talk back to their users, and automatically try out alternate solutions to a problem to come up with the best answer.

Some people say that the humans of the future will never be without their companion -- computers. Predicting the future can be tricky, of course. In 1948 an IBM study predicted that there would never be enough demand for computers to justify going into the business!

What is the purpose of the passage？

A．To tell the readers what computers will look like in the future.

B．To show the close relations between man and computers.

C．To tell the readers how important silicon microchips are.

D．To talk about the possible future uses of computers.

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第10题

Radiocarbon DatingNowadays scientists can answer many questions about the past through a t

Radiocarbon Dating

Nowadays scientists can answer many questions about the past through a technique called radiocarbon(放射性碳), or carbon-14, dating. One key to understanding how and why something happened is to discover when it happened.

Radiocarbon dating was developed in the late 1940s by physicist Willard F. Libby at the University of Chicago. An atom of ordinary carbon, called carbon-12, has six protons(质子) and six neutrons(中子) in its nucleus. Carbon-14, or C-14, is a radioactive, unstable form. of carbon that has two extra neutrons(原子核). It returns to a more stable form. of carbon through a process called decay(衰减). This process involves the loss of the extra neutrons and energy from the nucleus.

In Libby's radiocarbon dating technique, the weak radioactive emissions(放射) from this decay process are counted by instruments such as a radiation detector and counter. The decay rate is used to determine the proportion of C-14 atoms in the sample being dated.

Carbon-14 is produced in the Earth's atmosphere when nitrogen(氮)-14, or N-14, interacts with cosmic rays(宇宙射线). Scientists believe since the Earth was formed, the amount of nitrogen in the atmosphere has remained constant. Consequently, C-14 formation is thought to occur at a constant rate. Now ratio of C-14 to other carbon atoms in the atmosphere is known. Most scientists agree that this ratio is useful for dating items back to at least 50,000 years.

All life on Earth is made of organic molecules(分子) that contain carbon atoms coming from the atmosphere. So all living things have about the same ratio of C-14 atoms to other carbon atoms in their tissues(组织). Once an organism(有机体) dies it stops taking in carbon in any form, and the C-14 already present begins to decay. Over time the amount of C-14 in the material decreases, and the ratio of C-14 to other carbon atoms goes down. In terms of radiocarbon dating, the fewer C-14 atoms in a sample, the older that sample is.

Nowadays many scientists depend on radiocarbon for dating age-old objects.

A．Right

B．Wrong

C．Not mentioned

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