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Questions 19 to 22 are based on the conversation you have just heard.

A．The dinosaurs want extinct.
B．A number of meteorites crashed into Earth.
C．Some animal species evolved.
D．Some plants went extinct.

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Policemen, firemen and emergency doctors all can be called first responders.

单项选择题

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。