单项选择题

To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to the world market demand.

A．improve
B．enhance
C．guarantee
D．gear
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单项选择题
The discussion was so prolonged and exhausting that ______ the speakers stopped for refreshments.
A．at large
B．at intervals
C．at ease
D．at random
单项选择题
The advancement of science and technology has demonstrated that a fact appearing to contradict to certain theory may actually be ______ a more advanced formulation of that theory.
A．consistent with
B．in opposition to
C．eliminated by
D．incompatible with
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