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Questions 17—20 are based on the following passage you have just heard. You have 20 seconds to read Questions 17—20. What will be a possible threat to plants in the future’

A．Storms and floods.
B．Disease and fire.
C．Rapid increase of the animal population.
D．Less space for their grow

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单项选择题

单项选择题

Questions 17—20 are based on the following passage you have just heard. You have 20 seconds to read Questions 17—20. What will be a possible threat to plants in the future’ 您的浏览器不支持 audio 元素。