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
America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
A．could
B．did
C．would
D．was
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