单项选择题

Some plants are so ______ to pollution that they can only survive in a perfectly clean environment.

A．infectious
B．sensitive
C．delicate
D．subject
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单项选择题
They tossed your thoughts back and forth for over an hour, but still could not make ______ of them.(2013年北京航空大学考博试题)
A．impression
B．comprehension
C．meaning
D．sense
单项选择题
What is the ______ in going by boat when the plane costs no more and is quicker(2002年武汉大学考博试题)
A．impression
B．meaning
C．comprehension
D．sense
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