单项选择题


Questions 16 to 20 are based on the following talk.

A． Malocclusion.
B． Stress.
C． Smoking.
D． Caffeine.
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单项选择题
A． His own family.B． Holiday pictures.C． Other people’s children.D． Pictures of other artistic areas.
A． His own family.
B． Holiday pictures.
C． Other people’s children.
D． Pictures of other artistic areas.
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