单项选择题

Good travelers don't leave ______ on trains or airplanes.

A. rubbish
B. litter
C. garbage
D. pollutant
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单项选择题
The first sentence in this paragraph is ______ ; it can be interpreted in many ways.
A. intricate
B. ambiguous
C. duplicated
D. confused
单项选择题
The ______ talks between China and the United States were the base of the later agreement.
A. original
B. primary
C. initial
D. primitive
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