单项选择题

This is a highly ______ new heating system.
A、efficiency
B、efficient
C、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
单项选择题
She is ______ tall as you arE.A、notB、soC、as
A.A、not
B、so
C、as
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