单项选择题

It is difficult for us to explain phenomena that we have little or ______ direct knowledge.

A. no any
B. no
C. none
D. nothing
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单项选择题
Anyone breaking the roles will be asked to leave ______.
A. at the spot
B. on the spot
C. for the spot
D. in the spot
单项选择题
Consumers should do ______ than simply complain about the poor quality of goods.
A. much less
B. some more
C. far less
D. far more
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