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Q15:
FastMart, a convenience store chain, is planning to add pancake syrup to the items it sells. FastMart stores do not have shelf space to stock more than one variety of syrup. Surveys of FastMart customers indicate that one-fourth of them prefer low-calorie syrup, while three-fourths prefer regular syrup. Since FastMart’s highest priority is to maximize sales, the obvious strategy for it is to stock regular syrup.
Which of the following, if true, most seriously weakens the argument?
A:  eople buying pancake syrup at convenience stores, unlike those buying it at supermarkets, generally buy it only a few times.
People who prefer low-calorie syrup generally use about the same amount of syrup on their pancakes as those who prefer regular syrup.
Regular syrup does not sell for a higher price per unit than low-calorie syrup.
In general, customers who prefer regular syrup will buy low-calorie syrup if regular is unavailable, but those who prefer low-calorie will not buy regular syrup. D
Sales of syrup are not expected to account for a large proportion of total dollar sales at the average FastMart store.
Q29:
The Earth’s rivers constantly carry dissolved salts into its oceans. Clearly, therefore, by taking the resulting increase in salt levels in the oceans over the past hundred years and then determining how many centuries of such increases it would have taken the oceans to reach current salt levels from a hypothetical initial salt-free state, the maximum age of the Earth’s oceans can be accurately estimated.
Which of the following is an assumption on which the argument depends?
The quantities of dissolved salts deposited by rivers in the Earth’s oceans have not been unusually large during the past hundred years.
At any given time, all the Earth’s rivers have about the same salt levels.
There are salts that leach into the Earth’s oceans directly from the ocean floor.
There is no method superior to that based on salt levels for estimating the maximum age of the Earth’s oceans. A
None of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans.
Q38:
Outbreaks of Rift Valley fever occur irregularly in East Africa, several years apart. When outbreaks do occur, they kill thousands of cattle. A livestock vaccine against the disease exists but is rarely used. It is too expensive for farmers to use routinely, and since it is not effective until a month after vaccination, administering it after an outbreak begins helps very little. Nevertheless, experts predict that use of the vaccine will increase significantly within the next few years.
Which of the following, if true, provides the strongest justification for the experts’ prediction?
Rift Valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.
When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak.
It would take less than a month for producers of the vaccine to adjust their production operations to cope with a large increase in demand.
Many cattle farmers in East Africa are nomadic or live in remote villages, and such farmers, who have little access to modern veterinary medicine, are particularly hard hit by outbreaks of Rift Valley fever. E
Recently published research has shown that certain identifiable climatic conditions are almost invariably followed, within two to five months, by an outbreak of Rift Valley fever.
三道题死活不明白,希望各位指点迷津,谢谢. | 
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发表于 2006-2-1 20:03:00
