单项选择题

Now almost all the students have a monthly ______ towards their expenses.

A．salary
B．allowance
C．wage
D．fee
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单项选择题
An oil-field in the North Sea can cost hundreds of millions of pounds to bring into ______.
A．produces
B．productivity
C．production
D．products
单项选择题
We still know little about outer ______ though we have made much effort in research.
A．heaven
B．universe
C．space
D．sky
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