单项选择题

Cancer is second only ______ heart disease as a cause of death.

A. of
B. to
C. with
D. from
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单项选择题
The scientists have absolute freedom as to what research they think it best to ______.
A. engage
B. devote
C. seek
D. pursue
单项选择题
She refused to ______ the door key to the landlady until she got back her deposit.
A. hand in
B. hand out
C. hand down
D. hand over
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