单项选择题

A．Fall.
B．Rise.
C．V-shape.
D．Zigza
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单项选择题
A．Turn off the switch.B．Open the door.C．Stop smoking.D．Turn on the switc
A．Turn off the switch.
B．Open the door.
C．Stop smoking.
D．Turn on the switc
单项选择题
A．distortionsB．deformationsC．malfunctionsD．malformations
A．distortions
B．deformations
C．malfunctions
D．malformations
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