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Scientists recently tested samples of most major brands of prepared baby food and found that more than half the strained fruit and vegetable products tested contained pesticide residues. But in all cases the pesticides were at levels well below established government limits, so there is no danger of ill effects from pesticide residues for infants who eat these foods. Which of the following, if true, most seriously weakens the argument? A. All the major brands of prepared baby food had at least one product that was found to contain pesticides. B. Homemade baby food made with fruits and vegetables that have been carefully washed contains far lower levels of pesticide residues than do the commercial baby food products that were tested. C. The likelihood that a product would be found to contain pesticides did not depend on the type of fruit or vegetable that product contained. D. Short-term exposure to pesticide residues in food rarely has long-term effects. E. The government limits were established solely on the basis of research about adult tolerances for levels of pesticide residues in food.
Mangroves are salt-tolerant trees that form dense masses along sheltered tropical shorelines, including those on the island of Kalami. On Kalami, traditional uses of mangrove wood are quite limited, and no significant fishing goes on in the mangrove swamps. Therefore, the islanders would reap substantial economic gain by accepting a recent offer made by a mainland woodchip company to pay the islanders a fair price for the right to harvest the wood in their mangrove swamps. Which of the following, if true, most seriously weakens the argument? A. Most of the species of fish that are important to the Kalami islanders’ fishing industry depend on mangrove swamps as spawning and nursery areas. B. A significant portion of the money that Kalami islanders might receive from the wood chip company would be devoted to modernizing the island’s fishing fleet. C. There is not enough indigenous forest left in the interior of Kalami to be of interest to the timber industry or even the woodchip industry. D. Mangroves do not thrive on the portion of the coastline of Kalami that is oriented toward the open ocean. E. Wood whose primary use is for woodchips is considerably less valuable than wood that is used in construction or in furniture making.
参考答案：EA
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发表于 2021-10-27 23:07:31
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