单项选择题

The ______ of three and five is four.

A．avenue
B．subtraction
C．average
D．total
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单项选择题
In order to improve our working conditions. this new scheme must be______.
A．adopted
B．adapted
C．addicted
D．adorned
单项选择题
Is ______ true that the scientist will give us a lecture next week
A．this
B．that
C．it
D．what
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