单项选择题

Questions 15 to 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 plants do many insects tend to attack

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

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单项选择题

单项选择题

Questions 15 to 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 plants do many insects tend to attack 您的浏览器不支持 audio 元素。