单项选择题

These weapons add a new（）to modern warfare.

A.flavor
B.factor
C.aspect
D.dimension

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Every teacher ought to（）kids to think about current issues.

A.incorporate
B.reinforce
C.challenge
D.transform
单项选择题
The sale usually takes place outside the house, with the audience（）on benches, chairs or boxes.

A.seated
B.seating
C.having seated
D.having been seated
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