单项选择题

A．Wearing arm weights while you are swimming.
B．Jogging vigorously in one place for a long time.
C．Using bicycles that require you to use both your arms and legs.
D．Walking slowly while swinging your arms back and forth.
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单项选择题
A．To observe people attitude towards strangers.B．To see how people get along with their friends.C．To chance people’s behaviour in social life.D．To find out how shy people are.
A．To observe people attitude towards strangers.
B．To see how people get along with their friends.
C．To chance people’s behaviour in social life.
D．To find out how shy people are.
单项选择题
A．ArchaeologicalB．Biological.C．Meteorological.D．Sociological.
A．Archaeological
B．Biological.
C．Meteorological.
D．Sociological.
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