单项选择题

The pollution question as well as several other issues is going to be discussed when the Congress is in ______ again next spring.

A．assembly
B．conference
C．convention
D．session
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单项选择题
As the clouds drifted away an even higher peak became ______ to the climbers.
A．obvious
B．visible
C．present
D．apparent
单项选择题
We ______ Edison's success to his intelligence and hard work.
A．describe
B．subject
C．attribute
D．refer
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