5. Adelle： The government’s program to reduce the unemployment rate in the province of Carthena by encouraging job creation has failed， since the rate there has not changed appreciably since the program began a year ago.
Fran： But the unemployment rate in Carthena had been rising for three years before the program began， so the program is helping.
Which of the following， if true， most strongly counters Fran’s objection to Adelle’s argument?
(A) The government is advised by expert economists， some of whom specialize in employment issues.
(B) The unemployment rate in the province of Carthena has historically been higher than that of the country as a whole.
(C) The current government was elected by a wide margin， because of its promises to reduce the unemployment rate in Carthena.
(D) Around the time the government program began， large numbers of unemployed Carthena residents began leaving the province to look for work elsewhere.
(E) The unemployment rate in Carthena had been relatively stable until shortly before the current government took office.
6. Soft Drink Manufacturer：Our new children’s soft drink， RipeCal， is fortified with calcium.Since calcium is essential for developing healthy bones， drinking RipeCal regularly will help make children healthy.Consumer Advocate：But RipeCal also contains large amounts of sugar， and regularly consuming large amounts of sugar is unhealthful， especially for children.
In responding to the soft drink manufacturer， the consumer advocate does which of the following?
(A) Challenges the manufacturer’s claim about the nutritional value of calcium in children’s diets
(B) Argues that the evidence cited by the manufac-turer， when properly considered， leads to a conclusion opposite to that reached by the manufacturer.
(C) Implies that the manufacturer of a product is typically unconcerned with the nutritional value of that product.
(D) Questions whether a substance that is healthful when eaten in moderation can be unhealthful when eaten in excessive amounts.
(E) Presents additional facts that call into question the conclusion drawn by the manufacturer.
7.Over a period of several months， researchers attached small lights to the backs of wetas —flightless insects native to New Zealand—enabling researchers for the first time to make comprehensive observations of the insects’ nighttime activities.Thus， since wetas forage only at night， the researchers’ observations will significantly improve knowledge of the normal foraging habits of wetas.
Which of the following is an assumption on which the argument depends?
(A) Researchers were interested only in observing the wetas’ foraging habits and so did not keep track of other types of behavior.
(B) No pattern of behavior that is exhibited by wetas during the nighttime is also exhibited by wetas during the daytime.
(C) Attaching the small lights to the wetas’ backs did not greatly alter the wetas’ normal night-time foraging habits.
(D) Wetas typically forage more frequently during the months in which the researchers studied them than they do at other times.
(E) The researchers did not use other observational techniques to supplement their method of using small lights to track the nighttime behavior of wetas.
8.People whose bodies cannot produce the substance cytochrome P450 are three times as likely to develop Parkinson’s disease， a disease that affects the brain，as are people whose bodies do produce this substance.Since cytochrome P450 protects the brain from toxic chemicals， toxic chemicals probably play a role in the development of Parkinson’s disease.
Which of the following， if true， most strongly supports the argument?
(A) It will soon be possible for cytochrome P450 to be synthesized for the treatment of people whose bodies cannot produce this substance.
(B) Many people whose bodies are unable to produce cytochrome P450 lack the ability to produce certain other substances as well.
(C) Cytochrome P450 has no effect on the brain other than to protect it from toxic chemicals.
(D) People with Parkinson’s disease often exhibit a marked lessening in the severity of their symp-toms when they are treated with dopamine， a chemical produced naturally in the brain.
(E) Many people with Parkinson’s disease have the ability to produce cytochrome P450 naturally.
参考答案： 1.D 2.E 3.C 4.C