单项选择题

A. He is watering the flowers. B. He is a worker.
C. He does it well. D. He can do everything.
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单项选择题
The author seems to say that the invention of the computer is ______ that of the steam and petrol engines.
A. less important than

B. far more important than
C. at least as important as

D. not so important as
单项选择题
It has been about ______years since man succeeded in making rain.
A. 50
B. 55

C. 61
D. 70
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