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
Although Alice had expected her parents to be worried by her long, unexplained absence, both her mother and father seemed quite ______.
A．unavailable
B．undecided
C．unworried
D．unexpected
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单项选择题
India is ______ to China.
A．contagious
B．contiguous
C．contingent
D．contentious
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