例. Increase in the level of high-density lipoprotein (HDL) in the human bloodstream lower bloodstream-cholesterol levels by increasing the body’s capacity to rid itself of excess cholesterol. Levels of HDL in the bloodstream of some individuals are significantly increased by a program of regular exercise and weight reduction.
Which of the following can be correctly inferred from the statements above?
A. Individuals who are underweight do not run any risk of developing high levels of cholesterol in the bloodstream.
B. Individuals who do not exercise regularly have a high risk of developing high levels of cholesterol in the bloodstream late in life.
C. Exercise and weight reduction are the most effective methods of lowering bloodstream cholesterol levels in humans.
D. A program of regular exercise and weight reduction lowers cholesterol levels in the bloodstream of some individuals.
E. Only regular exercise is necessary to decrease cholesterol levels in the bloodstream of individuals of average weight.
A. 不足重的人没有得高胆固醇的风险。Weight reduction不等于underweight。无关项。
D. 绝大多数被南非蚊子叮咬之后，不可能有严重 的病发症状；
例3. To be mentally healthy, people must have self-respect. People can maintain self-respect only by continually earning the respect of others they esteem. They can earn this respect only by treating these others morally.
Which of the following conclusions can be properly drawn from the statements above?
A. People who are mentally healthy will be treated morally by others.
B. People who are mentally healthy will have treated morally those they esteem.
C. People who are mentally healthy must have self-respect in order to be treated morally by others.
D. People can expect to be treated morally by others only if they esteem these others.
E. People who have self-respect seldom treat morally those esteem.
例4. Meteorite explosions in the Earth’s atmosphere as large as the one that destroyed forests in Siberia, with approximately the force of a twelve-megaton nuclear blast, occur about once a century. The response of highly automated systems controlled by complex computer programs to unexpected circumstances is unpredictable.
Which of the following conclusions can most properly be drawn, if the statements above are true, about a highly automated nuclear-missile defense system controlled by a complex computer program?
A. Within a century after its construction, the system would react inappropriate and might accidentally start a nuclear war.
B. The system would be destroyed if an explosion of a large meteorite occurred in the Earth’s atmosphere.
C. It would be impossible for the system to distinguish the explosion of a large meteorite from the explosion of a nuclear weapon.
D. Whether the system would respond inappropriately to the explosion of a large meteorite would depend on the location of the blast.
E. It is not certain what the system’s response to the explosion of a large meteorite would be, if its designers did not plan for such a contingency.
例5. Rural households have more purchasing power than do urban or suburban households at the same income level, since some of the income urban and suburban households use for food and shelter can be used by rural households for other needs.
Which of the following inferences is best supported by the statement made above?
A. The average rural household includes more people than does the average urban or suburban household.
B. Rural households have lower food and housing costs than do either urban or suburban households.
C. Suburban households generally have more purchasing power than do either rural or urban households.
D. The median income of urban and suburban households is generally higher than that of rural households.
E. All three types of households spend more of their income on food and housing than on all other purchases combined.