更多"When scientists are trying to under"的相关试题:
[单项选择]When scientists are trying to understand a particular set of phenomena, they often make use of a "model." A model, in the scientists’ sense, is a kind of analogy or mental image of the phenomena in terms of something we are familiar with. One example is the wave model of light. We cannot see light as if it were made up of waves because experiments on light indicate that it behaves in many respects as water waves do.
The purpose of a model is to give us a mental or visual picture -- something to hold onto -- when we cannot see what is actually happening. Models often give us a deeper understanding: the analogy to a known system (for instance, water waves in the above example) can suggest new experiments to perform and can provide ideas about what other related phenomena might occur.
Why are models necessary
A. They connect invisible phenomena to those we are familiar with.
B. Scientists could not experiment without them.
C. They give the scientist a sense of security.
D. They provide deeper insight into the workings of the human min
[单项选择]Only computer scientists understand the architecture of personal computers, and only those who understand the architecture of personal computers appreciate the advances in technology made in the last decade. It follows that only those who appreciate these advances are computer scientists.
Which one of the following most accurately describes a flaw in the reasoning in the argument
A. The argument contains no stated or implied relationship between computer scientists and those who appreciate the advances in technology in the last decade.
B. The argument ignores the fact that some computer scientists may not appreciate the advances in technology made in the last decade.
C. The argument ignores the fact that computer scientists may appreciate other things besides the advances in technology made in the last decade.
D. The premises of the argument are stated in such a way that they exclude any possibility of drawing any logical conclusion.
E. (E) The premises of the argument presuppose that everyone understands the architecture of personal computers.
[单项选择]Over the centuries, scientists have been trying hard to find satisfactory substitutes for precious stones but failed many times.
Many years ago, a chemist surprised the world by saying: It should be possible to make a precious stone that not only looks like the real thing, but that is the real thing. The only difference should be that one crystal would be made by man, the other by nature.
At first this did not seem like a particularly hard task. Scientists began to try making synthetic diamonds towards the end of the eighteenth century and discovered a key scientific fact: diamonds are a form of carbon, which is a very common element.
Then, why not change a cheap and plentiful substance, carbon, into a rare and expensive one, diamond This change takes place in nature, so it should be possible to make it happen in the laboratory.
It should be possible, but for 150 years every effort failed though several people believed that they had solved the diamond riddle
A. it is a real thing that man was able to make a precious stone as nature can do.
B. man should be able to make a precious stone that is exactly the same as a natural one.
C. there is only a little difference between a man-made crystal and a nature-made one.
D. scientists expect a small difference between a man-made crystal and a nature-made one.
[单项选择]Scientists have been trying to ______ what factors can cause aging.
A. find out
B. turn out
C. set out
D. carry out
[单项选择]Some scientists are trying to eliminate malaria by developing a GM mosquito that can’t transmit the disease.（ ）
A. remove
B. fabricate
C. enhance
D. utilize
