单项选择题

However ______ certain natural resources may be, they cannot reproduce themselves and are bound to be used up ultimately.

A．abundant
B．adequate
C．sufficient
D．satisfactory
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单项选择题
I lived in a small, poor village when I was young. My experience made me very ______ to the suffering of others.
A．realistic
B．sensible
C．reasonable
D．sensitive
单项选择题
The rushing taxi had to ______ because the traffic lights had turned red.
A．catch up
B．cut up
C．shut up
D．pull up
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