单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.

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单项选择题

A．Its chemical elements must be studied.B．Its temperature must be lowered.C．Big spaceships must be built.D．Its atmosphere must be changed.

A．Its chemical elements must be studied.
B．Its temperature must be lowered.
C．Big spaceships must be built.
D．Its atmosphere must be changed.

填空题

adapted

Questions 23 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

Questions 23 to 25 are based on the conversation you have just heard.