单项选择题

A．Quiet plants.
B．Well-watered plants
C．Healthy plants.
D．Thirsty plants.
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单项选择题
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.
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
A．By taking out a patent on it.B．By building houses.C．By further perfecting his design.D．By telling others.
A．By taking out a patent on it.
B．By building houses.
C．By further perfecting his design.
D．By telling others.
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