单项选择题

Automatic machines can only do the jobs they （） to do.

A. have asked
B. ask
C. have been asked
D. will ask

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Different cultures have different communication （）

A. styles
B. crafts
C. designs
D. symbols
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Only by reading extensively（）you horizons.

A. you may widen
B. can you widen
C. you will widen
D. therefore you widen
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