单项选择题

_________ some mammals came to live in the sea is not known.

A．Which
B．Since
C．Although
D．How
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单项选择题
His heroic public image was seriously _________ by the rumor.
A．detracted
B．distracted
C．retracted
D．subtracted
单项选择题
We are flying at a (an) _________ of 20,000 feet.
A．altitude
B．aptitude
C．latitude
D．attitude
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