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All whales fall into two groups, those with teeth and those without. Both beluga and dolph

in belong to the suborder of toothed whales known as Odontoceti, along with porpoises, narwhals, pilot whales, killer whales and the largest toothed creature in the world, the sperm whale. Size differences among the Odontoceti are remarkable. A common porpoise will run only 4 or 5 feet in length and 300 pounds in weight; a sperm whale may be 10 times as long and 300 times as heavy. The beluga falls in between, weighing up to 2,000 pounds. And it does chirp. In fact, it makes a great variety of squeaking, whistling, and clicking sounds, which have earned it the name of sea canary.

The toothless, or baleen, whales belong to the suborder of Mysticeti. This is a group of generally large whales, formerly abundant in all the oceans of the world. Though reduced by hunting, most species are still found along the coasts of the United Stated and Canada. All but two of the Mysticeti reach 40 feet or more at maturity, with the blue whale running up to 100 feet and tipping the scales at up to 130 tons. This whale is by far the largest creature that has ever lived on earth, 4 times the weight of the largest dinosaur, 30 times that of an elephant.

With what topic is the passage mainly concerned？

A．Breeding habits of whales.

B．Differences between whales.

C．Efforts to preserve whales.

D．The intelligence of whales.

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更多“All whales fall into two group…”相关的问题

第1题

B Last fall was a first-of-its-kind season. I did not arrange （安排) any after-school clas

B

Last fall was a first-of-its-kind season. I did not arrange (安排) any after-school classes formy children. No swimming.'No music lessons. No play dates. Nothing.

Once they finished their homework, they were free to do what they pleased, but only onehour of TV. In the beginning, my sons, Ben, 11, and Nick, 9, were anxious about this sudden,unplanned freedom. I had to, push them out of the door with a ball, a bike, and so on. "Play？ Iordered.

I learned that this new plan takes time, patience and a lot of faith in the theory that havingexcellent grades isn't really important.

When my older kids, now in college and high school, were young, I brought in the rules ofmodern parenting. They are unspoken, but followed carefully. First, you must let your childhave a variety of activities. After all, you never know where you'll find a genius (天才). Second, if the child shows the slightest talent (才能), the activity must be pushed with lessons, special coaching (辅导) and practice of several days a week. Every minute should be taken and every minute has a purpose. That was really too much for my children.

Now with the new plan, we told stories, We listened to music. And' the. kids played with bikes, balls, and whatever was handy. Nobody kept score. In fact, the boys played outside so much that the lawn was worn down to the soil in places. They've made friends with those who come from all over the neighbourhood to play games.

We like those peaceful evenings. Ben and Nick have a good time this fall, MaYbe that's because the time offhas allowed us to enjoy each other's company;

40.What was new for the family last fall？

A. The children began to learn music when school was over.

B. The writer arranged no' extra lessons for the children.

C.The writer found no time to play with the sons.

D. The children had nothing toclo alter schooli

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第2题

Human‘sbrainsarelargerinproportiontotheirbodiesthan_______.A.whalesB.awhaleC.thatofwhalesD

Human‘s brains are larger in proportion to their bodies than _______. A. whales B. a whale C. that of whales D. those of whales

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第3题

The whales stranded on the beach followed the dolphin to safety probably becauseA.they und

The whales stranded on the beach followed the dolphin to safety probably because

A.they understood the dolphin？s instruction “Follow me”

B.they had signals in common with one another

C.they recognized some other animals not far away

D.they shared those inter-species signals with the dolphin

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第4题

Before Moko the dolphin turned up，the beached whales were in clear distress．But when Moko

arrived at Mahia beach on the east coast of New Zealand？S North Island，their mood changed and they followed him to safety． The ability of some animals to communicate is well known. What？s less well documented，however，is the communication between species．Justin Gregg, vice president of the Dolphin Communication Project，said it is possible that a dolphin and a whale could communicate in some way．“But it wouldn？t be instructions like ？Hey，buddy，the open ocean is over here.Follow me, ？"he says． Dolphins use three forms of signaling to other dolphins—whistles，clicking and postures．A whale might have signals in common with a dolphin，just as different species of dolphins are known to share signals which might theoretically allow a form of basic inter species communication．But just as it？s possible that Moko the dolphin and the stranded whales shared a signal，it is also possible that the whales just saw a vaguely similar creature and followed it． There are many reasons why different species communicate，says Vincent Janik，lecturer at the Sea Mammal Research Unit at St Andrew？s University．“The animals exploit the systems of others for their own benefits．Sometimes the benefits are the same for each，therefore they share information．Sometimes they are trying to take advantage of the other．Getting food may not be to the advantage of the one giving up the food” What happened after Moko the dolphin appeared at Mahia beach？

A.The beached whales still felt distressful

B.Moko 1ed the whales back to the sea

C.The whales were still stuck on the beach

D.Moko and the whales swam together ashore

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第5题

完成下列各题 D Popular British author，Charles Dickens’（1812—187

完成下列各题 D Popular British author，Charles Dickens’(1812—1870)family could hardly make ends meet．They could only afford to send one of their six children to school．Dickens was not that child．His parents chose to send a daughter，who had a talent for music，to an academy． His lather was placed in prison for debts．And，being the oldest male at home，Dickens worked at a factory．His horrible experience there became the ruel for his future writing．His father was freed three months later，and Dickens was then sent to school． From l836 to 1837，he wrote a series of stories．Thus the Pickwick Papers came into being，which brought fame to him．His works are Oliver Twist，Tale of Two Cities，David Copperlield and Hard Times． “I do not write bitterly or angrily．for I know all these things have worked together to make me what I am．”he once said． His difficult childhood did indeed shape the person he became，as well as his writing career there are shades of young Dickens in many of his most beloved characters，including David Coppeffield and Oliver Twist．“Minds，like bodies，will often fall into an ill—conditioned state from too much comfort．”he once wrote． The book that called public attention to Dickens was________．

A.David Copperfield

B.Oliver Twist

C.Tale of Two Cities

D.The Pickwick Papers

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第6题

完成下列各题 A If you are writing or studyin9，it make

s very much difference where the light comes from．People who use books and pens every day have to be especially careful about the way the light shines on their work． Every house gets i ts light either from daylight through the windows--which is the very best to use--or from lamps or electricity：but whichever kind of light it is，the way it shines toward our book or work is a matter of great importance to the eyes． Take a book．sit with your back toward the window，and try to read．Your shadow(影子) falls all over the page and makes it almost as bad for your eyes as if you were in a dark room． Now turn around and face the window．The page is in the shadow again，while the bright light is in your eyes． Try sitting with you fight side toward the window．This is very well for reading，but if you were writing．the shadow of your hand would fall across the page and bother(打搅)you a little． There is just one other way：sit with your left side to the window．Now everything is perfect for reading and for writing，too． Whatever kind oi light is in the room，the rule about the right to sit is always the same． Which of the following is true？

A.How the light shines on our work is of much importance．

B.The way the light shines on your work makes no difference．

C.We needn't care about where the light comes from．

D.People can write or study under a light that comes from any direction．

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第7题

Considered as a continuous body of fluid, the atmosphere is another kind of ocean. Yet, in

view of the total amount of rain and snow on land areas in the course of a year, one of the most amazing water facts is the very small amount of water in the atmosphere at any given time. The volume of the lower seven miles of the atmosphere--the realm of weather events- is roughly four times the volume of the world's oceans. But the atmosphere contains very little water. It is chiefly in the form. of invisible vapor, some of which is carried over land by air currents. If all vapor suddenly fell from the air onto the earth's surface, it would form. a layer only about one inch thick. A heavy rainstorm on a given area may use up only a small percentage of the water from the air mass that passes over. How, then, can some land areas receive more than 400 inches of rain per year？ How can several inches of rain fall during a single storm in a few minutes or hours？ The answer is that rain yielding air masses are in motion, and as the driving air mass moves on, new moist air takes its place.

The basic source of most water vapor is the ocean, evaporation, vapor transport, and precipitation (陈雨) make up the continuous movement of water from ocean to atmosphere to land and back to the sea. Rivers return water the sea. In an underground arc (弧) of the cycle, flowing bodies of water discharge some water directly into rivers and some directly to the sea.

What might have been discussed before this passage？

A．The ocean.

B．The earth.

C．The rainfall.

D．The atmosphere.

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第8题

Racing the clock every day is such an exhausting effort that when I actually have a fe

w free moments，I tend to collapse.

A. fall down

B. fall in

C. fall out

D. fall behind

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第9题

A. call B. fall C. halfD. talk

A. call

B. fall

C. half

D. talk

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第10题

If you are writing or studying,it makes very much difference where the light comes from. P

eople who use books and pens every day have to be especially careful about the way the light shines on their work.

Every house gets its light either from daylight through the windows—which is the best to use—or from lamps or electricity;but whichever kind of light it is, the way it shines toward our book or work is a matter of great importance to the eyes.

Take a book，sit with your back toward the window，and try to read. Your shadow(影子)falls all over the page and makes it almost as bad for your eyes as if you were in a dark room.

Now turn around and face the window. The page is in the shadow again,while the bright light is in your eyes.

Try sitting with your right side toward the window. This is very well for reading, but if you were writing,the shadow of your hand would fall across the page and bother(打撹)you a little.

There is just one other way：sit with your left side to the window. Now everything is perfect for reading and for writing,too.

Whatever kind of light is in the room,the rule about the right to sit is always the same.

Which of the following is true？

A.How the light shines on our work is of much importance

B.The way the light shines on your work makes no difference

C.We needn’t care about where the light comes from

D.People can write or study under a light that comes from any direction

When you sit with your face towards the window,____.A.your shadow falls on your book

B.your book is in a shadow

C.the light is still dark

D.the light is on your page

The best way both for reading and for writing is to_____.A.sit facing the light

B.let the light shine from your back

C.sit with your right side towards the light

D.have the light come ffrom your left

请帮忙给出每个问题的正确答案和分析，谢谢！

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