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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