单项选择题

Questions 9 to 12 are based on the conversation you have just heard.

A．About human beings.
B．About mosquitoes.
C．About the earth.
D．About insects,

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单项选择题

单项选择题

Questions 9 to 12 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。