Questions 6-7 are based on the following.

Suitable habitats for gray wolves have greatly diminished in area. In spite of this fact, the most sensible course would be to refrain from reestablishing gray wolves in places where previously they have been hunted out of existence. Striving to bring back these animals to places where they will only face lethal human hostility is immoral.

6.     The argument above depends on

(A) an appeal to an authority

(B) a belief that gray wolves are dangerous to human beings and livestock

(C) an assumption that two events that occur together must be causally connected

(D) an assumption that the future will be like the past（D）

(E) a threat of violence against those persons presenting the opposing view

7.     The argument above would be most significantly weakened if which of the following were true?

(A) Effective laws against the hunting of gray wolves have been enacted.

(B) Ranchers, farmers, and hunters still have an ingrained bias against gray wolves.

(C) By the 1930’s bounty hunters had exterminated most of the gray wolves in the United States.

(D) Programs for increasing the gray wolf population are not aided by federal laws that require the licensing of hunters of certain predators.（A）

(E) Suggested programs for increasing the gray wolf population have been criticized by environmentalists and biologists.

8.     For the safety-conscious Swedish market, a United States manufacturer of desktop computers developed a special display screen that produces a much weaker electromagnetic field surrounding the user than do ordinary screens. Despite an advantage in this respect over its competitors, the manufacturer is introducing the screen into the United States market without advertising it as a safety improvement.Which of the following, if true, provides a rationale for the manufacturer’s approach to advertising the screen in the United States?

(A) Many more desktop computers are sold each year in the United States market than are sold in the Swedish market.

(B) The manufacturer does not want its competitors to become aware of the means by which the company has achieved this advance in technology.

(C) Most business and scientific purchasers of desktop computers expect to replace such equipment eventually as better technology becomes available on the market.

(D) An emphasis on the comparative safety of the new screen would call into question the safety of the many screens the manufacturer has already sold in the United States.（D）

(E) Concern has been expressed in the United States over the health effects of the large electromagnetic fields surrounding electric power lines.

9.     In the suburbs surrounding Middletown, there is an average of 2.4 automobiles per family, and thus very few suburban residents use public buses. The suburban communities, therefore, would derive little benefit from continuing to subsidize the portion of Middletown’s public bus system that serves the suburbs.Which of the following, if true, casts the most serious doubt on the conclusion drawn above?

(A) The real-estate tax rate in Middletown is higher than it is in the suburbs.

(B) Last year voters in the suburban communities defeated by a narrow margin a bill designed to increase subsidies for public bus routes.

(C) Many suburban shops can attract enough employees to remain in business only because subsidized public transportation from Middletown is available.

(D) Public buses operated with less than a 35 percent occupancy rate produce more pollution per passenger mile than would the operation of private automobiles for each passenger.（C）

(E) Most voters in Middletown’s suburban communities are unwilling to continue subsidies for public buses next year if ridership on those buses drops below current levels.