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．track
B．trail
C．trace
D．clue
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单项选择题
The lady in red ______ when the motor rushed away all of a sudden.
A．was hurting herself
B．was hurt herself
C．was to hurt herself
D．was almost hurt
单项选择题
We have a high regard for Prof. Joseph because he always ______ his principles.
A．lives on
B．lives up to
C．lives down
D．lives with
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