单项选择题

The mixture of elements in the air can be thought ________ a solution of gases.

A．of as
B．of
C．as
D．of to
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单项选择题
The program has helped Chinese and American scholars ________ friendship and learn about each other's culture.
A．cement
B．stiffen
C．straighten
D．establish
单项选择题
That the child disturbed the class ________ made the teather very angry.
A．continuously
B．continually
C．considerably
D．constantly
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