单项选择题

If you find this item too difficult to it is advisable to leave as it is and move on to the next one.

A. work out
B. work on
C. work for
D. work at
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单项选择题
People who live in small towns often seem more friendly than those living in ______ populated areas.
A. densely
B. intensely
C. abundantly
D. extremely
单项选择题
Because of the ______ of its ideas, the book was in wide circulation both at home and abroad.
A. originality
B. subjectivity
C. generality
D. ambiguity
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