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单项选择题
A．They should help maintain the equipment.B．They should teach their children how to use the equipment.C．They should stop their children from climbing ladders.D．They should keep a watchful eye on their children.
A．They should help maintain the equipment.
B．They should teach their children how to use the equipment.
C．They should stop their children from climbing ladders.
D．They should keep a watchful eye on their children.
单项选择题
A．On a busy street.B．In a Hong Kong hotel.C．At an airport.D．At a booking office.
A．On a busy street.
B．In a Hong Kong hotel.
C．At an airport.
D．At a booking office.
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