单项选择题

What could scientists do if Robert's theory proves to be true

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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热门试题

单项选择题

What do plants do when they are thirsty

A．They give out faint cries.
B．They make noises to drive away insects.
C．They extend their water pipes.
D．They become elastic like rubber bands.

单项选择题

What plants do many insects tend to attack

A．Quiet plants.
B．Well-watered plants.
C．Healthy plants.
D．Thirsty plants.