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1. A new variety of cotton first grown commercially last year produces a natural insecticide. Promoters suggested that switching to the new variety would virtually eliminate cotton growers’ need for chemical insecticides, but last year the fields where this variety was planted did require such insecticides, applied in half the usual amounts per acre. Therefore, even cotton growers who switch entirely to the new variety are unlikely to reduce their chemical insecticide use by more than half. Which of the following, if true, most seriously weakens the argument? A. The seed for this cotton variety is currently available only through a few distributors and is significantly more expensive than is other cotton seed. B. A larger number of growers purchased seed for the new variety this year than last. C. Cotton growers who planted the new variety of cotton last year generally planted only that variety. D. Because the new cotton variety produces particularly long fibers, it brings a high market price. E. Weather conditions in cotton-growing regions last year were extremely favorable for most insect pests that damage cotton crops.
2. Biologist: Species with broad geographic ranges probably tend to endure longer than species with narrow ranges. The broader a species’ range, the more likely that species is to survive the extinction of populations in a few areas. Therefore, it is likely that the proportion of species with broad ranges tends to gradually increase with time. The biologist’s conclusion follows logically from the above if which of the following is assumed? A. There are now more species with broad geographic ranges than with narrow geographic ranges. B. Most species can survive extinctions of populations in a few areas as long as the species’ geographic range is not very narrow. C. If a population of a species in a particular area dies out, that species generally does not repopulate that area. D. If a characteristic tends to help species endure longer, then the proportion of species with that characteristic tends to gradually increase with time. E. Any characteristic that makes a species tend to endure longer will make it easier for that species to survive the extinction of populations in a few areas.
参考答案： ED
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发表于 2021-7-14 17:14:14
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