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mechanism
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单项选择题
A．separate itB．use 3-D techC．put something in itD．remove something from it
A．separate it
B．use 3-D tech
C．put something in it
D．remove something from it
单项选择题
A．openB．happyC．self-protectedD．humble
A．open
B．happy
C．self-protected
D．humble
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