单项选择题

Most insulation devices of this kind, ______ manufactured for such purposes, are extremely expensive to install.

A．that are
B．which is
C．those are
D．as are

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单项选择题

De you mind ______ Go ahead. I don't mind.

A．turning on the fan
B．I turn on the fan
C．if I turn on the fan
D．to turn on the fan

单项选择题

John Locke, the well-known 18th century English thinker, emphasized experience as the condition for expansion of human knowledge.

A．incompatible
B．incredible
C．indefinite
D．indispensable

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