单项选择题

A．Two.
B．Three.
C．Four.
D．Five.
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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.
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