更多"Many scientists remain ______ about"的相关试题:
[单项选择]
Many things about language are a mystery, and many will always remain so. But some things we do know.
First, we know that all human beings have a language of some sort. There is no race of men anywhere on earth so backward that it has no language. And, in historical times, there has never been a race of men without a language.
Second, there is no such thing as a primitive language. There are many people whose cultures are undeveloped, who are, as we say, uncivilized, but the languages they speak are not primitive. In all known languages we can see complexities that must have been tens of thousands of years in developing. This has not always been well understood; indeed, the direct contrary has often been stated. Popular ideas of the language of the American Indians will illustrate. Many people have supposed that the Indians communicated in a very primitive system of noises. Study has proved this to be nonsense. There are, or were, hundreds of American Indian languages, and all of them turn out to be very complicated and very old. They are certainly different from the languages that most of us are familiar with, but they are no more primitive than. English and Greek.
A third thing we know about language is that all languages are perfectly adequate. That is, each one is a perfect means of expressing the culture of the people who speak the language.
Finally, we know that language changes. It is natural and normal for language to changes the only languages which do not change are the dead ones. This is easy to understand if we look backward in time. Change goes on in all aspects of language. Grammatical features change as do speech sounds, and changes in vocabulary are sometimes very extensive and may occur very rapidly. Vocabulary is the least stable part of any language.
In the second paragraph the author thinks that（）.
A. some backward race doesn’t have a language of its own
B. some race in history didn’t possess a language of its own
C. any human race, whether backward or not, has a language
D. some races on earth can communicate without language
[单项选择]It is no use（）to her about the value of life.
A. talk
B. talking
C. to talk
D. talked
[单项选择]
Like so many things of value, truth is not always easy to come by. What we regard as true shapes our beliefs, attitudes, and actions. Yet we can believe things that have no basis in fact. People are capable of embracing horrific precepts that seem incredible in retrospect. In Nazi Germany, Adolf Hitler had millions of followers who accepted his delusions about racial superiority. As Voltaire put it long before Hitler’s time, "Those who can make you believe absurdities can make you commit atrocities. "
We are surrounded by illusions, some created deliberately. They may be subtle or may affect us profoundly. Some illusions, such as films and novels, we seek out and appreciate. Others can make us miserable and even kill us. We need to know if particular foods that taste perfectly fine can hurt us in the short term (as with Salmonella contamination) or in the long term (cholesterol), whether a prevalent virus is so dangerous that we should avoid public places,
A. Hitler was obsessed with violence
B. irrational ideas may be spread widely
C. irrational ideas may lead to violence
D. Hitler was misled by racism
[单项选择]Scientists have advanced many theories about why human beings cry tears , none of （） has been proved.
A. whom
B. which
C. what
D. that
[单项选择]What do many scientists worry about the disease
A. There is no effective way of treating it.
B. It may spread quickly among birds and poultry.
C. It may affect the world economy and politics.
D. It may change to an epidemic among human beings.
[单项选择]There are many commonly held beliefs about eyeglasses and eyesight that are not proven facts. For instance, some people believe that wearing glasses too soon weakens the eyes. But there is no evidence to show that the structure of eyes is changed by wearing glasses at a young age. Wearing the wrong glasses, however, can prove harmful. Studies show that for adults there is no danger, but children can develop loss of vision if they have the wrong glasses.
We have all heard some of the common myths about how eyesight gets bad. Most people believe that reading in dim light causes pool eyesight, but that is unique. Too little light makes the eyes work harder, so they do get tired and strained. Eyestrain also results from reading a lot, reading in bed, and watching too much television. But, although eyestrain may cause some pain or headaches, it does not permanently damage eyesight.
Another myth about eyes is that they can be replaced, or transferred from one person to another. The
A. different types of eyeglasses
B. a visit to the eye doctor
C. myths about eyesight
D. cornea transplants
[填空题]Many cultures have different ideas about why people catch colds. For example, in the United States, some people think that you can catch cold if your (1) get cold. So, mothers tell little children to wear (2) boots in the winter. In other places, including parts of the Middle East, some people believe that strong winds cause colds. So, on trains and buses, people usually don’t like to sit (3) open windows. In parts of Europe, some people think that wearing wet clothes will give you a cold. They say that after you go (4) , you should quickly put on dry clothes. Today, scientists know that colds are caused by viruses. But the old ideas are still very strong, and many people still follow them to (5) getting ill.Many cultures have different ideas about why people catch colds. For example, in the United States, some people think that you can catch cold if your (1) get cold. So, mothers tell little children to wear (2)
