单项选择题

Mr. Brown doesn't think that all bad languages should be allowed. In his opinion, there are ______ that should be kept up.

A. degrees
B. standards
C. levels
D. limits
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单项选择题
More and more people choose to shop in the supermarket, for they are especially interested in the ______ of goods on offer.
A. price
B. variety
C. value
D. amount
单项选择题
Next to the hole ______, ______ a bell was fastened.
A. a nail was there; to that
B. was a nail; to which
C. was a nail; to that
D. a nail was there; from which
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