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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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
单项选择题
46()

A.from 
B.for 
C.to 
D.about
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