单项选择题


A．Indifferent.
B．Worried.
C．Happy.
D．Angry.
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单项选择题
A．A woman.B．A man.C．A driver.D．A actress.
A．A woman.
B．A man.
C．A driver.
D．A actress.
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
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