单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage.
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 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. What will be a possible threat to plants in the future 您的浏览器不支持 audio 元素。