单项选择题

The scientists have absolute freedom as to what research they think is the best to______

A．engage
B．devote
C．seek
D．pursue
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单项选择题
Fat cannot change into muscle ______ muscle changes into fat.
A．any more than
B．no more than
C．no less than
D．much more than
单项选择题
The work in the office was ______ by a constant stream of visitors.
A．confused
B．hampered
C．reverend
D．perplexed
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