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
Drugs that speed up ______.
选项
答案E
解析 依据是第二段第二句话“Drugs that speed up signals passing through the nervous system, which is made up of the brain and spinal cord, and produce alertness and arousal and, in higher doses, excitability，and inhibit fatigue and sleep, are called stimulants”。
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