单项选择题

A．dangerous
B．undesirable
C．safe
D．terrible
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单项选择题
A．involvingB．involvedC．containedD．containing
A．involving
B．involved
C．contained
D．containing
单项选择题
A．receivingB．sendingC．receiveD．send
A．receiving
B．sending
C．receive
D．send
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