9. “Substance abuse” (Line 5, Paragraph 1) is preferable to “drug abuse” in that _____.

　　[A]substances can alter our bodily or mental functioning if illegally used

　　[B]“drug abuse” is only related to a limited number of drug takers

　　[C]alcohol and tobacco are as fatal as heroin and cocaine

　　[D]many substances other than heroin or cocaine can also be poisonous

　　10. The word “pervasive” (Line 1, Paragraph 2) might mean _____.

　　[A]widespread

　　[B]overwhelming

　　[C]piercing

　　[D]fashionable

　　11. Physical dependence on certain substances results from _____.

　　[A]uncontrolled consumption of them over long periods of time

　　[B]exclusive use of them for social purposes

　　[C]quantitative application of them to the treatment of diseases

　　[D]careless employment of them for unpleasant symptoms

　　12. From the last paragraph we can infer that _____.

　　[A]stimulants function positively on the mind

　　[B]hallucinogens are in themselves harmful to health

　　[C]depressants are the worst type of psychoactive substances