填空题

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 ______.

【参考答案】

E

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A. 10 percent to 25 percent for the proportion of workers who use drugs occasionally on the jobB. determine exactly when simple drug use becomes abuseC. the 1920s until the 1960sD. the 1960s until the 1970sE. signals passing through the nervous system Drugs that speed up ______.