单项选择题

A．dangerous
B．undesirable
C．safe
D．terrible
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单项选择题
A．longerB．olderC．weakerD．younger
A．longer
B．older
C．weaker
D．younger
单项选择题
A．receivingB．sendingC．receiveD．send
A．receiving
B．sending
C．receive
D．send
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