单项选择题

A．Motor vehicles were constantly arriving or departing.
B．Tasty food.
C．A comfortable, medium- sized hotel.
D．Old - fashioned service.
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单项选择题
Now scientists have found in the past few years______.
A．the exposure of DNA to the public is unnecessary
B．the tiny cell in DNA is a neat little machine
C．man knows nothing about DNA
D．man has much to learn about DNA
单项选择题
The principle discovery in this century shows______.
A．man has overthrown Newton' s laws of physics
B．man has solved a new set of gigantic puzzles
C．man has lost many scientific discoveries
D．man has given up some of the once accepted theories
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