单项选择题

Questions 22 to 25 are based on the passage you have just heard. What will be a possible threat to plants in the future

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

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单项选择题

单项选择题

Questions 22 to 25 are based on the passage you have just heard. What will be a possible threat to plants in the future 您的浏览器不支持 audio 元素。