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1、Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.
Which of the following conclusions can properly be drawn from the information above?
A The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behavior. .
B Host insects lack any effective defenses against the form of predation practiced by parasitic wasps. .
C Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species. .
D Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs. .
E Parasitic wasps use visual clues to calculate the size of a host egg.
2、The total market value of real estate in Altonville has steadily declined over the past four years. This decline has meant that the overall figure on which the city's property tax is based-the assessed value of that real estate-has also declined. The percentage of assessed value that was paid as property taxes to the city, however, did not change from year to year during this period.
The information above most strongly supports which of the following?
A The percentage of Altonville's yearly revenue that comes from money collected in property taxes did not change over the past four years. .
B The percentage of Altonville's yearly revenue that comes from money collected in property taxes has declined steadily over the past four years. .
C The amount of revenue that Altonville collected from property taxes was lower last year than it was four years ago. .
D During the past four years, Altonville officials increased tax rates on other sources of revenue such as retail sales and business profits. .
E Altonville will soon require property owners to pay a higher percentage of the assessed value of their property as property tax.
3、In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.
Which of the following, if true, gives the most support to the recommendation above?
A The accepted treatment for pironoma does not have damaging side effects. .
B The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma. .
C In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life. .
D The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma. .
E All laboratory tests to detect pironoma have the same proportion of false negative results.
4、In the year following an eight-cent increase in the federal tax on a pack of cigarettes, sales of cigarettes fell ten percent. In contrast, in the year prior to the tax increase, sales had fallen one percent. The volume of cigarette sales is therefore strongly related to the after-tax price of a pack of cigarettes.
The argument above requires which of following assumptions?
A During the year following the tax increase, the pretax price of a pack of cigarettes did not increase by as much as it had during the year prior to the tax increase. .
B The one percent fall in cigarette sales in the year prior to tax increase was due to a smaller tax increase. .
C The pretax price of a pack of cigarettes gradually decreased throughout the year before and the year after the tax increase. .
D For the year following the tax increase, the pretax price of a pack of cigarettes was not eight or more cents lower than it had been the previous year. .
E As the after-tax price of a pack of cigarettes rises, the pretax price also rises.
5、In order to finance road repairs, the highway commission of a certain state is considering a 50 percent increase in the 10-cents-per-mile toll for vehicles using its toll highway. The highway commissioner claims that the toll increase will increase the annual revenue generated by the toll highway by at least 50 percent per year.
Which of the following is an assumption on which the highway commissioner's claim depends?
A The amount of money required annually for road repairs will not increase from its current level. .
B The total number of trips made on the toll highway per year will not decrease from its current level. .
C The average length of a trip made on the toll highway will not decrease from its current level. .
D The number of drivers who consistently avoid the highway tolls by using secondary roads will not increase from its current level. .
E The total distance traveled by vehicles on the toll highway per year will not decrease from its current level.
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发表于 2014-3-20 09:00:03
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