题目内容
（请给出正确答案）
Scientists say it may be ten years______this medicine was put to use.
A．since
B．before
C．after
D．when
如果结果不匹配，请 联系老师 获取答案
更多“Scientists say it may be ten y…”相关的问题
The article does not say whether the scientists' experiments with dogs have ______.
A．benefited animals other than dogs
B．served man
C．helped other dogs
D．contributed to medical knowledge
A.would be ideal
B.would have been ideal
C.will be ideal
D.will have been ideal
阅读下列短文，然后根据短文的内容从 55～57 小题的四个选择项中选出最佳的一项。
B
Scientists have searched for many years for a method to tell whether a volcano（火山）explosion will be small or large. Now，four scientists say they have discovered something in lava（熔岩）that will help do this. They did the research on Mount Unzen on the southern Japanese island of Kyushu.
Mount Unzen exploded in November，1990. Since then，more explosions have killed 43 people and destroyed the homes of more than 2，000 others. The volcano is still active today.
The scientists say the lava of the volcano contains high level of an element（成份），which is a sign of the presence of the lava from deep in the earth，not from the surface. They say it shows that the lava coming directly from inside the earth is connected with huge explosions instead of smaller ones.
The scientists examined the lava from 18 explosions of Mount Unzen that took place during many thousands of years. They also studied the lava from other volcanoes in the area that are older than Mount Unzen. The lava studied came from both large and small explosions. The scientists found that large explosions contained more of the element than small ones. The scientists say if they had known this two years earlier，they could have warned the people living in the area near Mount Unzen and saved many lives.
第 55 题 From the passage we learn that Mount Unzen is the name of ______.
A．a huge volcano explosion
B．a Japanese island
C．an active volcano
D．a kind of lava
Research experience is an essential element of hearing and promotion at a research university because it is the emphasis on research that distinguishes such a university from an arts college. Some professors, however, neglect teaching for research and that presents a problem.
Most research universities reward outstanding teaching, but the greatest recognition is usually given to achievements in research. Part of the reason is the difficulty of judging teaching. A highly responsible and tough professor is usually appreciated by top students who want to be challenged but disliked by those whose records are less impressive. The mild professor usually gets high overall ratings, but there is a sense of disappointment on the part of the best students. Thus, a university trying to promote professors primarily on the basis of teaching qualities would have to confront this confusion.
As modern science moves faster, two forces are exerted on professors: one is the time needed to keep up with the profession; the other is the time needed to teach. The training of new scientists requires outstanding teaching at the research university as well as the arts college. Although scientists are usually made in the elementary schools, scientists can be lost by poor teaching at the college and graduate school levels. The solution is not to separate teaching and research but to recognize that the combination is difficult but vital. It is time for universities to reserve the title of professor for those willing to profess, willing to be an earnest part of the community of scholars. Professors unwilling to teach can be called "distinguished research investigators." or something else.
The pace of modern science makes it increasingly difficult to be a great researcher and a great teacher. Yet many are described in just those terms. Those who say we can separate teaching and research simply do not understand the system, but those who say the problem will disappear are not fulfilling their responsibilities.
What point does the author intend to put across in the first paragraph？
A．Teaching and research are two contradictory fields.
B．Research can never be overemphasized.
C．The relationship between research and teaching should not be simplified.
D．It is not right to overestimate the importance of teaching.
根据下面内容，回答题：
Scientists in the UK have announced that the piranhafish"s reputation 21 a fearsome 22 may well not be deserved. The fish， which is found in the Amazon in Brazil， have been 23 as deadly carnivores（食肉动物 ） that work in shoals to overwhelm their prey and strip it of its flesh in seconds.
However， experts 24 St Andrews University say that piranhas are omnivores（杂食动物） that mainly eat fish， plants and insects. They form. big groups not to hunt but to defend 25 against other predators， according to the team.
"Previously it was thought piranhas shoaled as it 26 them to form. a cooperative hunting group，" said Professor Anne Magurran. " 27， we have found that it is primarily a defensive behavior. "
Piranhas can be attacked by animals 28 dolphins， caimans and large fish， so forming a shoal is a good way of 29 being killed. Piranhas of 30 age stay in the middle of the group for 31 and the 32 of the shoal differs according to the level of 33 When the water level is 34， the fish form. small groups as there is space to escape， but when the water level drops， they form. large groups as protection 35 predators.
材料题请点击右侧查看材料问题 查看材料
A.as
B.as if
C.as though
D.since
Many Native Americans closely resemble Asians. This has led most scientists to(1)believe something about Native Americans. They think that most Native Americans(2)from a distant group of people. These people(3)from Siberia across the Bering Strait, between 17,000-11,000 years ago. The exact time and 4 is still under question. That is, it is still a(n)(5)of debate. The time they traveled and the route they took is still being argued, as is whether it happened(6).
(7)recently, some anthropologists (人类学家) argued that the migration occurred 12,000 years ago. However, there are a number of difficulties with this theory —(8)particular, the presence of people in the Americas earlier than one might think. There is growing evidence of human(9)in Brazil and Chile 11,500 years ago or earlier. There is also(10)of humans living in the Americas some 50,000 years ago.(11), other possibilities have been suggested.
They may have(12)the land bridge several thousand years earlier or they may have sailed along the western coast. However, some(13)this theory. They think that humans(14)skills for sailing during that era.
Some consider the genetic and cultural evidence for an Asian origin overwhelming. It should be noted,(15), that some other people are very upset at this idea. Many present-day Native Americans(16)the above theories. They say those who put forward such theories have political(17)They have their own traditional stories that offer(18)of where they came from. Their own stories claim that their(19)are different from what scientists say. Those accounts, though, have mostly been(20)by scholars. Therefore, the origin of Americans still remains a mystery to be explored.
Language is always changing.The earliest known languages had complicated grammar but a small, limited vocabulary.Over the centuries, the grammar changed, and the vocabulary grew.For example, the English and Spanish people who came to America during the sixteenth and seventeenth centuries gave names to all the new plants and animals they found.In this way, hundreds of new words were introduced into English and Spanish vocabularies.Today life is changing very fast, and language is changing fast, too.
There are several major language families in the world.Some scientists say there are nine main families, but other scientists divide them differently.The languages in each family are related, and scientists think that they came from the same parent language.
We learn our own languages by listening and copying.We do this without studying or thinking about it.But learning a foreign language takes a lot of study and practice.
(1).What do all languages in the world have？
A.Complicated vocabularies
B.Single grammar
C.Large vocabularies
D.A system of sounds
(2).What does the earliest known languages have？
A.Different word orders
B.Difficult grammar
C.Difficult vocabularies
D.Easy sound system
(3).What did the English and Spanish people who came to America do？
A.They gave names to different animals
B.They found many new plants and animals
C.They changed the grammar of English and Spanish
D.They introduced new words into English and Spanish
(4).Scientists think that the languages in each family_________________________.
A.are related
B.should be divided differently
C.should be separated
D.are not very different
(5).According to the passage, we learn our own language by_________________________.
A.thinking about it
B.practicing it
C.listening and copying
D.studying it
A．detected
B．caught
C．disclosed
D．revealed
【B5】 he, however, might tremble at the 【B6】 of what he is about to do. Together with another two scientists, he is publishing a paper which not only 【B7】 that one group of humanity is more intelligent than the others, but explains the process that has brought this about. The group in 【B8】 are a particular people originated from central Europe. The process is natural selection.
This group generally do well in IQ test, 【B9】 12-15 points above the 【B10】 value of 100, and have contributed 【B11】 to the intellectual and cultural life of the West, as the 【B12】 of their elites, including several world-renowned scientists, 【B13】. They also suffer more often than most people from a number of nasty genetic diseases, such as breast cancer. These facts, 【B14】, have previously been thought unrelated. The former has been 【B15】 to social effects, such as a strong tradition of 【B16】 education. The latter was seen as a (an) 【B17】 of genetic isolation. Dr. Cochran suggests that the intelligence and diseases are intimately 【B18】. His argument is that the unusual history of these people has 【B19】 them to unique evolutionary pressures that have resulted in this 【B20】 state of affairs.
【B1】
A．selected
B．prepared
C．obliged
D．pleased
Language skills are believed to develop best in the first three years when the place is rich withsounds and sights. Scientists say children should hear the speech and language of other people againand again. The first signs of communication(交际) happen during the first few days of life.when ababy learns that crying will bring food and attention.
Research shows that most children recognize the general sounds of their native language by sixmonths of age. By that time, a baby usually begins to make sounds. By the end of their first year, mostchildren are able to say a few simple words, although they may not understand the meaning of thewords. By 18 months of age, most children can say between eight and ten words. By two years of age,most children are able to make simple sentences. By ages three,four and five,the number of words achild can understand quickly increases. It is at these ages that children begin to understand the rulesof language. When do babies begin to learn according to doctors？
A.Right after they are born.
B.Not until they are five months old
C.When they are six months old
D.As soon as they are one year old
Babies will smile whenA.they are wet or hungry
B.they want to get the best care
C.they want to talk to others
D.they learn sounds and words
What do most children begin to do from age three or older？A.Make sounds.
B.Make simple sentences.
C.Say a few words.
D.Understand language rules.
What would be the best title for the text？A.The Language of Babies
B.When Do Babies Learn to Talk
C.The Roles of Cry and Smile
D.How Babies Understand Words
请帮忙给出每个问题的正确答案和分析，谢谢！
