单项选择题

The (economical) difficulties of the country will not diminish (unless) inexpensive (fertilizer) can be widely (distributed).

A．economical
B．unless
C．fertilizer
D．distributed
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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
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
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