单项选择题

A. Two important tests of a new airliner before it is put into use.
B. How to carry out tank test in the water.
C. How pilots carry out the test flight.
D. How to make a safe passenger plane.
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单项选择题
A. Man will probably be able to live there in 200 years. B. Scientists are rather pessimistic about it. C. Man will probably be able to live there in 100,000 years’time. D. Scientists are optimistic about overcoming the difficulties soon.
A. Man will probably be able to live there in 200 years.
B. Scientists are rather pessimistic about it.
C. Man will probably be able to live there in 100,000 years’time.
D. Scientists are optimistic about overcoming the difficulties soon.
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