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. Trees in rainforests have broad leaves. The advantage is______.

A．to accept more sun light
B．to encourage the heavy rain to run off the leaves
C．to shade their roots
D．to hide their trunk

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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. Trees in rainforests have broad leaves. The advantage is______. 您的浏览器不支持 audio 元素。