2. 外语
  3. A. 10 percent to 25 percent for the proportion of workers who use drugs occasionally on the job B. determine exactly when simpl

A. 10 percent to 25 percent for the proportion of workers who use drugs occasionally on the job B. determine exactly when simpl

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问题 A. 10 percent to 25 percent for the proportion of workers who use drugs occasionally on the job
B. determine exactly when simple drug use becomes abuse
C. the 1920s until the 1960s
D. the 1960s until the 1970s
E. signals passing through the nervous system
It is not always easy to ______.
选项
答案B
解析 答案相关句是第三段第一句It is not always easy to determine exactly when simple drug use becomes abuse．
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