单项选择题

The current death rate is reduced _______ 10% compared with that of the year of 1980.
A、to
B、form
C、by

A.A、to
B、form
C、by
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This is a highly ______ new heating system.A、efficiencyB、efficientC、efficiently
A.A、efficiency
B、efficient
C、efficiently
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—Oh, by the way, how was your report of the new batteries coming along?—___________________________.A、It's going pretty wellB、Just go aheadC、Well, I'm afraid so
A.A、It's
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