单项选择题

The pollution problem as well as several other issues is going to be discussed when the congress is in __________ again next spring.

A．assembly
B．session
C．conference
D．convention
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单项选择题
People often make mistakes in their __________ as things in many cases turn out the opposite to their wishes.
A．predictions
B．productions
C．prepositions
D．prescriptions
单项选择题
I was unaware of the critical points involved, so my choice was quite ________.
A．arbitrary
B．deliberate
C．mechanical
D．unpredictable
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