单项选择题


Passage 2
Questions 13 to 15 are based on the passage you have just heard.

A．A woman.
B．A man.
C．A driver.
D．A actress.
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单项选择题
In the sentence Because humans are at the top of the food chain, they are particularly vulnerable to the effects of nondegradable pollutants. , vulnerable probably means ______.
A．defenseless
B．protected
C．strong
D．fragile
单项选择题
A．Breaking up.B．Dying out.C．Stopping.D．Disappearing.
A．Breaking up.
B．Dying out.
C．Stopping.
D．Disappearing.
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