单项选择题

The amount of time spent watching television in the average household in the United States has risen steadily since television sets were introduced in the 1950’s.

A. discreetly
B. consistently
C. automatically
D. disproportionately
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单项选择题
Engineering ethics a compulsory in every institute of science and technology in the United States.
A．Right
B．Wrong
C．Not mentioned
填空题
In ancient times, rainmakers tried to make rain for dry lands, but ______.
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