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单项选择题
A．Tuesday, Thursday and Friday.B．Monday, Thursday and Friday.C．Monday, Wednesday and Friday.D．Monday, Wednesday and Thursday.
A．Tuesday, Thursday and Friday.
B．Monday, Thursday and Friday.
C．Monday, Wednesday and Friday.
D．Monday, Wednesday and Thursday.
单项选择题
A．Health.B．Industry.C．Clean air.D．Pure water.
A．Health.
B．Industry.
C．Clean air.
D．Pure water.
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