1. Opiates such as morphine and heroin have a capacity to
A. alleviate pain
B. improve memory
C. enhance sensory awareness
D. do all of these things
2. Depressant drugs have been found to
A. facilitate falling asleep
B. disrupt the normal sleep cycle
C. reduce REM sleep
D. do all of these things
3. Which of the folowing drugs has the HIGHEST degree of risk for psychological dependence?
A. LSD
B. cocaine
C. cannabis
D. mescaline