单项选择题

21. When workers are organized in trade unions, employers find it hard to lay them

A．off
B．aside
C．out
D．down
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单项选择题
Foreign disinvestment and the ____________ of South Africa from world capital markets after 1985 further weakened its economy.
A．displacement
B．elimination
C．exclusion
D．exception
单项选择题
American companies are evolving from mass-production manufacturing to ____________ enterprises.
A．movable
B．changing
C．flexible
D．varying
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