单项选择题

Workers at this toy factory- had to suffer from ______ living and working conditions.

A．naive
B．nasty
C．native
D．naughty
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单项选择题
Some countries urgently need competent people to ______ a concept of development based on modernization.
A．manipulate
B．implement
C．oscillate
D．isolate
单项选择题
Some rural people in southern China still use water power to convert grain into flour.
A．divert
B．manufacture
C．transform
D．thrust
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