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T-3-Q24.
Each year red-winged blackbirds stop in a certain region of Midland Province on their spring and fall migration. In the fall, they eat a significant portion of the province’s sunflower crop. This year Midland farmers sought permits to set out small amounts of poisoned rice during the blackbirds’ spring stop in order to reduce the fall blackbird population. Some residents voiced concern that the rice could threaten certain species of rare migratory birds. Nevertheless, the wildlife agency approved the permits.
Which of the following, if true, most helps to justify the wildlife agency’s approval of the permits, given the concern voiced by some residents?
A. In the region where the red-winged blackbirds stop, they are the first birds to be present in the spring.
B. The poison that farmers want to use does not kill birds but rather make them incapable of producing viable eggs.
C. Since rice is not raised in midland province, few species of birds native to the province normally eat rice.
D. Without the permit, any farmers shown to have set out poison for the blackbirds would be heavily fined
E. The poison that farmers got approval to use has no taste or smell that would make it detectable by birds.这题我选了C，答案是A,求解释谢谢！
T-3-Q40.
Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.
Which of the following ,if true, most helps to confirm the explanation above?
A. Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges
B. Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
C. After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young
D. Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards.
E. The boreal owl requires less food, relative to its weight, than is required by members of other owl species.
这题我选的C,答案是B,解析说mammal的食物没了，所以mammal的数量少了，所以以mammal为食的owl也就要range over area了，这其中没有过度推断吗？
小弟选的C,不正强调了owl没有食物就不得不range over area吗？
快考试了，求高手指点，感激！！！ |
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发表于 2011-7-2 01:01:50
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