The field of medicine has always attracted its share of quacks and charlatans — disreputable women and men with little or no medical knowledge who promise quick cures at cheap prices. The reasons why quackery thrives even in modern times are easy to find.

　　To begin with, pain seems to be a chronic human condition. A person whose body or mind “hurts” will often pay any amount of money for the promise of relief. Second, even the best medical treatment cannot cure all the ills that beset men and women. People who mistrust or dislike the truths that their physicians tell them often turn to more sympathetic ears.

　　Many people lack the training necessary to evaluate medical claims. Given the choice between (a) a reputable physician who says a cure for cancer will be long, expensive and may not work at all, and (b) a salesperson who says that several bottles of a secret formula “snake oil” will cure not only cancer but tuberculosis as well, some individuals will opt for “snake oil”.

　　Many “snake oil” remedies are highly laced with alcohol or narcotic drugs. Anyone who drinks them may get so drunk or stoned that they drown their pains in the rising tide of pleasant intoxication. Little wonder that “snake oil” is a popular cure-all for minor aches and hurts! But let there be no misunderstandings. A very few “home remedies” actually work. However, most remedies sold by quacks are not only useless, but often can be harmful as well.

　　71. In this passage, a quack or a charlatan is someone who ____.

　　A. has a special ability B. has little knowledge

　　C. is not a good doctor D. pretends to be a doctor

　　72. The sentence “pain seems to be a chronic human condition” means pain seems to ____.

　　A. be very serious B. be very difficult

　　C. last for a long time D. be always happening

　　73. Quackery thrives even in modern times because ____.

　　patients pay any amount of money

　　patients do not like their physicians

　　quacks say that they can help patients

　　best medical treatment costs very much

　　74. People who seek the advice of quacks and charlatans are those who ____.

　　A. are poorly educated B. are highly educated

　　C. dislike medical treatments D. mistrust physicians’ truths

　　75. To evaluate medical claims, one must ____.

　　A. turn to reputable doctors B. make an adequate choice

　　C. have the necessary training D.. disbelieve promise of relief

　　76. According to the author, a very few home remedies are ____.

　　A. useless B. harmful C. pleasant D. effective