Just as sound travels through the air in waves, electricity travels through the air in ______ radio waves.
A. what is called B. which is called C. what it is called D. which it is called
It was _____ of Jack to turn off the radio when I was sleeping in the bedroom.
A. considerable B. considerate C. disturbing D. sensible
A student will be immediately dismissed if he/ she is found _____ in school.
A. smoke B. smoking C. to smoke D. smoked[来源:学+科+
I failed again in the exam and only then _____ how much time I had wasted.
A. I realized B. did I realize C. I had realized D. had I realized
What makes a person a scientist? Does he have ways or tools of learning that are different from those of others? The answer is “no”. It isn’t the tools a scientist uses but how he uses these tools which make him a scientist. You will probably agree that knowing how to use a power is important to a carpenter. You will probably agree, too, that knowing how to investigation, how to discover information, is important to everyone. The scientist, however, goes one step further; he must be sure that he has a reasonable answer to his questions and that his answer he gets to many questions is into a large set of ideas about how the world works.
The scientist’s knowledge must be exact. There’s no room for half right or right just half the time. He must be as nearly right as the conditions permit. What works under one set of conditions at one time must work under the same conditions at other times. If the conditions are different, any changes the scientist observes in a demonstration(实证) must be explained by the changes in the conditions. This is one reason why investigations are important in science. Albert Einstein, who developed the Theory of Relativity, arrived at the theory through mathematics. The accuracy(正确性) of his mathematics was later tested through investigation. Einstein’s ideas were proved to be correct. A scientist uses many tools for measurements. Then the measurements are used to make mathematical calculations(计算) that may test his investigations
1. What makes a scientist according to the passage?
A. The tools he uses. B. His ways of learning
C. The way he uses his tools D. The various tools he uses
2. “…knowing how to investigation, how to discover information, is important to everyone.”
The writer says this to show ___________.
A. the importance of information
B. the difference between scientists and ordinary people.
C. the importance of thinking
D. the difference between carpenters and ordinary people
3. A sound scientific theory should be one that _________.
A. works under one set of conditions at one time and also works under the same conditions at other times
B. doesn’t allow any change even under different conditions
C. Can be used many times under different conditions
D. Can be used for many purposes
4. What is the main idea of the passage?
A. Scientists are different from ordinary people.
B. The Theory of Relativity.
C. Exactness is the core (核心) of science.
D. Exactness and way of using tools are the keys to making of a scientist.
Fire can 36 many things. It is dangerous to everyone, but it is 37 useful. We cannot live without 38.In other words, fire is both the 39 and enemy of us. This 40 on whether we use it wisely or not.
To the people 41 live in the forest area, fire is particularly dangerous. It is the location 42 most of their houses are made of wood, which 43 catches fire. Especially in winter the air is 44 and the wind is often 45 .If one of these houses is on fire, the wind will 46 the fire to the neighboring houses quickly, and the fire will soon 47 all over the area. If this happens 48 , it may not be too bad. 49 if it happens at night, the situation will be very bad, for most people are 50 ,and many of them cannot run away in time. If they can, they will just 51 all the things behind. Some people even do not know 52 is going on, and they 53 in their dreams.
We should do our best to 54 the breakout of fire, which is mostly caused by people’s carelessness. Therefore, not only the people of the 55 areas but everyone else should be very careful in using fire.
1. A. make B. build C. lose D. destroy
2. A. also B. too C. hardly D. not
3. A. water B. air C. food D. fire
4. A. help B. friend C. companion D. neighbor
5. A. happens B. lies C. depends D. decides
6. A. where B. which C. what D. who
7.. A. because B. so C. why D. that
8. A. easily B. hardly C. carefully D. friendly
9.. A. thick B. thin C. wet D. dry
10. A. cold B. freezing C. gentle D. strong
11. A. make B. let C. blow D. give
12. A. cross B. pass C. happen D. spread
13.A. at night B. on Sunday C. in the evening D. in the day time
14. A. But B. When C. So D. Even
15.A. careless B. sleeping C. afraid D. frightened
16.A. leave B. take C. bring D. have
17.A. that B. what C. who D. which
18. A. think B. smile C. die D. live
19. A. help B. prevent C. develop D. keep
20. A. city B. developing C. factory D. forest
