单项选择题

Techniques to harness the energy of the sun are being developed.

A. convert
B. store
C. utilize
D. receive
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单项选择题
Our plan is to allocate one member of staff to handle appointments.()

A. assign
B. persuade
C. ask
D. order
单项选择题
After her death, her papers—including unpublished articles and correspondence—were deposited at the library.()

A. identifications
B. cards
C. files
D. documents
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