61. As the research indicates the efficacy of analgesic drugs ____.

1. may vary with sex
2. may be related with the degree of pain
3. are not decided by doctors but by patients
4. have nothing to do with sexual differences

62. Levine implies that the doctor is supposed to ____.

1. take men's pain seriously
2. use kappa-opioids to kill pain
3. pay attention to women's pain
4. consider sex while prescribing painkillers

63. In their studies the scientists were surprised to find that ____.

1. the women reported higher levels of pain
2. the women did not respond to kappa-opioids
3. kappa-opioids were not effective like morphine and heroin
4. sexual differences decided whether kappa-opioids were effective

64. According to Berkley, the effectiveness of painkillers ____.

1. could be explored in men
2. is clearly linked with age
3. is mainly influenced by sexual differences
4. might not be only decided by sexual differences

65. As Levine implies, the drugs abandoned as useless ____.

1. had been tailored to a particular type of patients
2. were not effective in different ages of groups
3. had not been developed properly
4. might work in women

(Reference keys.)