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1(Z). Which of the following most logically completes the argument below?

Although the number of large artificial satellites orbiting the Earth is small compared to the number of small pieces of debris in orbit, the large satellites interfere more seriously with telescope observations because of the strong reflections they produce. Because many of those large satellites have ceased to function, the proposal recently been made to eliminate interference from nonfunctioning satellites by exploding them in space. This proposal, however, is ill conceived, since .

A. many nonfunctioning satellites remain in orbit for years

B. for satellites that have ceased to function, repairing them while they are in orbit would be prohibitively expensive

C. there are no known previous instances of satellites’ having been exploded on purpose

D. the only way to make telescope observations without any interference from debris in orbit is to use telescopes launched into extremely high orbits around the Earth

E. a greatly increased number of small particles in Earth’s orbit would result in a blanket of reflections that would make certain valuable telescope observations impossible

2.(Z)Which of the following most logically completes the passage?

A certain tropical island received food donations in the form of powdered milk for distribution to its poorest residents, who were thought to be malnourished. Subsequently, the rate of liver cancers among those islanders increased sharply. The donated milk was probably to blame: recent laboratory research on rats has shown that rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein. This result is relevant because .

A. in the tropics, peanuts, a staple of these island residents, support a mold growth that produces aflatoxin.

B. the liver is more sensitive to carcinogens, of which aflatoxin may be one, than most other bodily organs.

C. casein is not the only protein contained in milk.

D. powdered milk is the most appropriate form in which to send milk to a tropical destination.

E. the people who were given the donated milk had been screened for their ability to digest milk.

正確答案：E A

3.(Z) Which of the following most logically completes the argument?

Yorco and Zortech are two corporations that employ large numbers of full-time workers who are paid by the hour. Publicly available records indicate that Yorco employs roughly the same number of such hourly wage workers as Zortech does but spends a far higher total sum per year on wages for such workers. Therefore, hourly wages must be higher, on average, at Yorco than at Zortech, since _____.

A. Zortech spends a higher total sum per year than Yorco does to provide its hourly wage workers with benefits other than wages

B. The work performed by hourly wage workers at Zortech does not require a significantly higher level of skill than the work performed by hourly wage workers at Yorco does

C. The proportion of all company employees who are hourly wage workers is significantly greater at Yorco than it is at Zortech

D. Overtime work, which is paid at a substantially higher rate than work done during the regular work week, is rare at both Yorco and Zortech

E. The highest hourly wages paid at Yorco are higher than the highest hourly wages paid at Zortech

4.(Z)Which of the following most logically completes the reasoning?

Either food scarcity or excessive hunting can threaten a population of animals. If the group faces food scarcity, individuals in the group will reach reproductive maturity later than otherwise. If the group faces excessive hunting, individuals that reach reproductive maturity earlier will come to predominate. Therefore, it should be possible to determine whether prehistoric mastodons became extinct because of food scarcity or human hunting, since there are fossilized mastodon remains from both before and after mastodon populations declined, and ______.

A. there are more fossilized mastodon remains from the period before mastodon populations began to decline than from after that period

B. the average age at which mastodons from a given period reached reproductive maturity can be established from their fossilized remains

C. it can be accurately estimated from fossilized remains when mastodons became extinct

D. it is not known when humans first began hunting mastodons

E. climate changes may have gradually reduced the food available to mastodons

正確答案：D B

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