单项选择题

A．They could drive the insects away.
B．They could keep the plants well-watered.
C．They could make the plants grow faster.
D．They could build devices to trap insects.
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单项选择题
A．She watched a movie all night.B．She had an eye operation.C．She took an exam all night long.D．She was studying all night.
A．She watched a movie all night.
B．She had an eye operation.
C．She took an exam all night long.
D．She was studying all night.
单项选择题
A．Their lack of concentration resulting from mental stress.B．The lack of consideration for them in equipment design.C．The probability of their getting excited easily.D．Their slowness in responding.
A．Their lack of concentration resulting from mental stress.
B．The lack of consideration for them in equipment design.
C．The probability of their getting excited easily.
D．Their slowness in responding.
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