单项选择题

Questions 15 and 17 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
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

单项选择题

Questions 15 and 17 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.Now, listen to the passage. What do plants do when they are thirsty 您的浏览器不支持 audio 元素。