单项选择题

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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单项选择题
A．They are shopping.B．They are jogging.C．They are seeing a movie.D．They are drinking coffee.
A．They are shopping.
B．They are jogging.
C．They are seeing a movie.
D．They are drinking coffee.
单项选择题
A．By studying the signs around them with eyes and brains.B．By changing the weather.C．By controlling the weather.D．By listening to others’ advice.
A．By studying the signs around them with eyes and brains.
B．By changing the weather.
C．By controlling the weather.
D．By listening to others’ advice.
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