单项选择题

A．He should sit in the smoking section.
B．He should ask the stewardess for help.
C．He should move to another part of the plane.
D．He should put out his cigarette at once.
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单项选择题
A．They should help maintain the equipment.B．They should keep a watchful eye on their children.C．They should stop their children from climbing ladders.D．They should teach their children how to use the equipment.
A．They should help maintain the equipment.
B．They should keep a watchful eye on their children.
C．They should stop their children from climbing ladders.
D．They should teach their children how to use the equipment.
单项选择题
A．Because it was their hometown.B．Because they wanted to help the AIDS patients.C．Because they were doing their summer social topics.D．They were learning medicine and doing research on HIV.
A．Because it was their hometown.
B．Because they wanted to help the AIDS patients.
C．Because they were doing their summer social topics.
D．They were learning medicine and doing research on HIV.
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