单项选择题

Intelligent readers know at once how ______ we are, and how skeptical, how firm for others and how diffident about ourselves.

A．incredible
B．credible
C．credulous
D．creditable
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单项选择题
The Department is the lead provider of essential______, with responsibility for transport, ports and marine, freight, information and communication technology, major development, energy and security.
A．equipment
B．facilities
C．infrastructure
D．installations
单项选择题
To his cosmopolitan mind such deviations from the social ______ were no more than are the irregularities of vale and mountain-chain to the whole terrestrial curve.
A．norm
B．criterion
C．measure
D．standard
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