单项选择题

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

A．He thinks flies will take over the earth.
B．He thinks human will die off quite soon,
C．He thinks mass disease could be the next path to extinction.
D．He sees human beings as destructive.
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单项选择题
A．Physics.B．Mathematics.C．Environmental science.D．Life science.
A．Physics.
B．Mathematics.
C．Environmental science.
D．Life science.
单项选择题
A．Because every species becomes extinct.B．Because humans beings are powerful enough to kill other species.C．Because of over-population.D．Because human being is still a young species though it is exploiting the environment.
A．Because every species becomes extinct.
B．Because humans beings are powerful enough to kill other species.
C．Because of over-population.
D．Because human being is still a young species though it is exploiting the environment.
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