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
We'll ______ you as soon as we have any further information.
A．notify
B．signify
C．communicate
D．impart
单项选择题
To an especially sensitive child, a simple scolding can be a ______ experience.
A．hysterical
B．grievous
C．gracious
D．sensible
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