单项选择题

47()

A.in
B.with
C.on
D.for

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单项选择题

(If) you want a (real) effective stereo that (plays) music clearly, you’d (better buy) a graphic equalizer.()

A. If
B. real
C. plays
D. better buy

单项选择题

(Transforming) raw materials (into) useful products (are) called (manufacturing).()

A. Transforming
B. into
C. are
D. manufacturing

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