Drug abuse can cause a wide variety of adverse physical reactions. Long-term drug use may (67) the heart, liver, and brain. Drug abusers may suffer from (68) if they habitually forget to eat, (69) afford to buy food, or eat foods (70) the proper vitamins and minerals. Individuals who abuse injectable drugs risk (71) infections such as hepatitis and HIV from dirty needles or needles shared with other (72) abusers. One of the most dangerous effects of (73) drug use is the potential for overdosing -- (74) is, taking too large or too p a dose for the body’s systems to handle. A drug overdose may cause an individual to lose (75) and to breathe inadequately. Without treatment, an individual may die (76) a drug overdose.
Drug (77) is marked by an irresistible thirst (78) a substance. Successful treatment methods vary and include psychological counseling, or psychotherapy, and detoxification programs- medically supervised programs that (79) wean (戒除) an individual from a drug (80) a period of days or weeks. Detoxification and psychotherapy are often used together.
The illegal use of drugs was once considered a problem (81) to residents of poor, urban neighborhoods. Today, however, people from all (82) levels, in both cities and suburbs, abuse drugs. Some people use drugs to (83) stress and to forget about their problems. Genetic factors may predispose (84) individuals to drug addiction. (85) factors such as peer pressure, especially in (86) people, and the availability of drugs, also influence people to abuse drugs.
A) Psychological C) Environmental
B) Essential D) Physical
参考答案：C
解析：上句提到遗传因素，那么此处空格应表示“外在因素”，因此选择[C] Environmental表示外在环境因素，诸如来自同龄人的压力以及毒品的可用性也会导致人们吸毒，正确。[A]Psychological“心理的”，[B]Essential“本质的”，[D]Physical“身体的”，都不恰当。