单项选择题

Do you believe that some fish can produce electricity strong enough to light a lamp or run a small electric motor（）

A.even
B.rather
C.else
D.further

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单项选择题
In the past, people in this poor hilly area couldn't even get enough to （）

A.five on
B.spend on
C.feed with
D.support with
单项选择题
You can come and see me （）you run into difficulty.

A.some time
B.in time
C.whenever
D.whether
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