单项选择题

Research has produced many new _______ that will be used in the manufacture of a variety of goods.

A．hypotheses
B．summaries
C．synthetics
D．emphases
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单项选择题
Advertisements may arouse a strong wish for something; how the need is filled will probably be the individual.
A．on to
B．up to
C．as to
D．down to
单项选择题
John said that he didn't quite _______ and asked me to repeat what I had said.
A．snatch up
B．summon up
C．catch on
D．watch out
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