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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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
单项选择题
We (will have) to (put off) our departure (in the case) it (rains).()

A. will have
B. put off
C. in the case
D. rains
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