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 simple

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

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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
Treatment of drug abuse in the United States was practically nonexistent from ______.
选项
答案C
解析 依据是第五段第一句话“From the 1920s until the 1960s，treatment of drug abuse in the United States was practically nonexistent”。
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