单项选择题

In this factory the machines are not regulated ______ but are jointly controlled by a central computer system.

A．independently
B．individually
C．irrespectively
D．irregularly
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单项选择题
Nobody yet knows how long and how seriously the shakiness in the financial system will ______ down the economy.
A．put
B．settle
C．drag
D．knock
单项选择题
My students found the book ______ , it providing them with an abundance of information on the subject.
A．enlightening
B．confusing
C．distracting
D．amusing
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