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

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单项选择题
(Transforming) raw materials (into) useful products (are) called (manufacturing).()

A. Transforming
B. into
C. are
D. manufacturing
单项选择题
According to the author, () may be the most important factor influencing healthy lifestyles.

A. technology
B. cultural background
C. environment
D. the desire to be healthy
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