单项选择题

This can help to ______ something that the students may not have comprehended.

A．signify
B．specify
C．testify
D．clarify
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单项选择题
The United States and Canada are lands of ______ except for the Indians, who are the only true natives.
A．emigrants
B．immigrants
C．dwellers
D．inhabitant's
单项选择题
Once the ______ contradiction is grasped, all problems will be readily solved.
A．principle
B．principal
C．potential
D．primitive
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