单项选择题

The each revolves both round the sun and on its own axis.

A．resolves
B．involves
C．evolves
D．rotates
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单项选择题
It is now believed that the dramatic changes in family structure, though regrettable, are im possible to reverse.
A．striking
B．emotional
C．horrible
D．sensational
单项选择题
The scientist's discovery will have a profound influence on mankind.
A．deep
B．moderate
C．negative
D．positive
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