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21.Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on the fact that
different local populations of bowerbirds of the same species build bowers that exhibit different building and
decorative styles, researchers have concluded that the bowerbirds' building styles are a culturally acquired,
rather than a genetically transmitted, trait.
Which of the following, if true, would most strengthen the conclusion drawn by the researchers?
(A)There are more common characteristics than there are differences among the bower-building styles of the local bowerbird population that has been studied most extensively.
(B)Young male bowerbirds are inept at bower-building and apparently spend years watching their elders before becoming accomplished in the local bower style.
(C)The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.
(D)Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.
(E)It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.
22.Plan: Concerned about the welfare of its senior citizens, the government of Runagia decided two years ago to
increase by 20 percent the government-provided pension paid to all Runagians age sixty-five and older.
Result: Many Runagian senior citizens are no better off financially now than they were before the increase.
Further information: The annual rate of inflation since the pension increase has been below 5 percent, and the
increased pension has been duly received by all eligible Runagians.
In light of the further information, which of the following, if true, does most to explain the result that followed
implementation of the plan?
(A)The majority of senior citizens whose financial position has not improved rely entirely on the government pension for their income.
(B)The Runagian banking system is so inefficient that cashing a pension check can take as much as three weeks.
(C)The prices of goods and services that meet the special needs of many senior citizens have increased at a rate much higher than the rate of inflation.
(D)The pension increase occurred at a time when the number of Runagians age sixty-five and older who were living below the poverty level was at an all-time high.
(E)The most recent pension increase was only the second such increase in the last ten years.
23.A drug that is highly effective in treating many types of infection can, at present, be obtained only from the bark
of the ibora, a tree that is quite rare in the wild. It takes the bark of 5,000 trees to make one kilogram of the
drug. It follows, therefore, that continued production of the drug must inevitably lead to the ibora's extinction.
Which of the following, if true, most seriously weakens the argument above?
(A)The drug made from ibora bark is dispensed to doctors from a central authority.
(B)The drug made from ibora bark is expensive to produce.
(C)The leaves of the ibora are used in a number of medical products.
(D)The ibora can be propagated from cuttings and grown under cultivation.
(E)The ibora generally grows in largely inaccessible places.
24.The Plexis Corporation, a leading computer chip manufacturer, is currently developing a new chip, which is
faster and more efficient than any computer chip currently in use. The new chip will be released for sale in
twelve months. Plexis' market research has shown that initial sales of the new chip would be maximized by
starting to advertise it now, but the company has decided to wait another six months before doing so.
Which of the following, if true, provides the Plexis Corporation with the best reason for postponing advertising
its new chip?
(A)Some computer users are reluctant to purchase new computer products when they are first released.
(B)The cost of an advertising campaign capable of maximizing initial sales of the new chip would be no greater than campaigns previously undertaken by Plexis.
(C)Advertising the new chip now will significantly decrease sales of Plexis' current line of computer chips.
(D)Plexis' major rivals in the computer chip manufacturing business are developing a chip with capabilities that are comparable to those of Plexis' new chip.
(E)Taking full advantage of the capacities of the new chip will require substantial adjustments in other segments of the computer industry. |
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发表于 2011-10-21 22:21:38
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C)The prices of goods and services that meet the special needs of many senior citizens have increased at a rate much higher than the rate of inflation.