单项选择题

Some scientists are dubious of the claim that organisms （）with age as an inevitable outcome of living.

A．depress
B．default
C．deteriorate
D．degrade

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单项选择题
This is a long （）-- roughly 13 miles down a beautiful valley to the little church below.

A．terrain
B．descent
C．degeneration
D．tumble
单项选择题
The doctors （）the newly approved drug into the patient when he was critically ill.

A．injected
B．ejected
C．projected
D．subjected
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