单项选择题

This book has been in the works so long that I have lost __ of most of the sources found for me by the staff of the library.

A．trace
B．trail
C．track
D．touch
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单项选择题
People under stress have performed ______ feats of strength, like lifting an automobile off an accident victim.
A．specific
B．extraordinary
C．abrupt
D．abnormal
单项选择题
After 10 hours at the wheel of the car, he began to feel the ______.
A．tension
B．nervous
C．exertion
D．strain
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