单项选择题

To their credit the Department of Energy ______ these ideas and funded a detailed study.

A．took over
B．took on
C．took up
D．took to
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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
单项选择题
We'll ______ you as soon as we have any further information.
A．notify
B．signify
C．communicate
D．impart
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