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 build devices to trap insects.
D．They could make the plants grow faster.

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单项选择题
Why do people leave home to travel according to the passage（）

A．For education.
B．For adventure.
C．To enjoy themselves.
D．To look for a different lifestyle.
单项选择题
What plants do many insects tend to attack（）

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