单项选择题

Questions 18-20 are based on the following monologue introducing a nature tendency of plants. You now have 15 seconds to read Questions 18-20.
In this monologue, we can learn plants may develop mechanisms and adaptations ______.

A．to protect themselves from disasters
B．to avoid being hurt by human being
C．to fight against the hostile environment
D．to benefit the environment

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单项选择题

单项选择题

Questions 18-20 are based on the following monologue introducing a nature tendency of plants. You now have 15 seconds to read Questions 18-20. In this monologue, we can learn plants may develop mechanisms and adaptations ______. 您的浏览器不支持 audio 元素。