单项选择题

She can (hardly) avoid (making) grammatical mistakes in her (composition)(how) hard she tries.

A．hardly
B．making
C．composition
D．how
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单项选择题
When (imaginable) scientists (first) suggested the possibility that one person (could speak) directly to another (over) a long distance, few people took them seriously.
A．imaginable
B．first
C．could speak
D．over
单项选择题
Sleep is (controlled) by (the brain) and (associated by) characteristic (breathing) rhythms.
A．controlled
B．the brain
C．associated by
D．breathing
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