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 drag use becomes abuse
  • C. the 1920s until the 1960s
  • D. the 1960s until the 1970s
  • E. signals passing through the nervous system
  • F. describe the phenomenon of drug use

Drugs that speed up ______ are called stimulants.

【参考答案】

E
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