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

If the scheme is () carried out without waste of time or energy I shall be completely satisfied.

A. relatively
B. noticeably
C. appropriately D. efficiently

单项选择题

One day we all may find it useful to have a(n) () for sending documents, writing any pictures across the telephone lines.

A. receiver
B. echo
C. extension
D. facility

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