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

On a rainy day I was driving north through Vermont ______ I noticed a young man holding up a sign reading Boston .

A．which
B．where
C．when
D．that

单项选择题

______is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth

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