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.
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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.
单项选择题
What is characteristic of learners of special English
A．They want to change the way English is taught.
B．They learn English to find well paid jobs.
C．They want to have an up-to-date knowledge of English.
D．They know clearly what they want to learn.
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