The best title for the passage is ______.
A. Possible Asteroid Smash in the Future
B. New Discoveries about 1950DA
C. Asteroids in the Solar System
D. Future Threat--An Asteroid Smash into the Earth
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In which of the following ways does the passage state that the San Antonio project differed from those in Boston and Minneapolis？
A. It was designded to combat urban decay.
B. It occurred in the business district.
C. It involved the environment as well as buildings.
D. It consisted primarily of new construction.
According to the passage, which of the folloving statements is true？
A. Scientists have managed to know more things about asteroid 1950DA
B. Many people seem to be worried about the predicted asteroid smash.
C. Scientists are atill quite optimistic about man's future.
D. The Earth is faced with frequent threats from space.
According to the passage, prison ______ in some way.
A. makes prisoners violent
B. makes criminal characteristics worse
C. causes sexual problems in most prisoners
D. destroys prisoners' spirits
It can be inferred from the passage that scientists of the 18th century ______.
A. thought that they knew a great deal and could solve most problems of science
B. did no more than good in promoting man's understanding of nature
C. knew that they were ignorant and wanted to know more about nature
D. were afraid of facing up to the realities of scientific research
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