4. The gray squirrel, introduced into local woodlands ten years ago, threatens the indigenous population of an endangered owl species, because the squirrels’ habitual stripping of tree bark destroys the trees in which the owls nest. Some local officials have advocated setting out poison for the gray squirrels. The officials argue that this measure, while eliminating the squirrels, would pose no threat to the owl population, since the poison would be placed in containers accessible only to squirrels and other rodents. Which one of the following, if true, most calls into question the officials’ argument? (A) One of the species whose members are likely to eat the poison is the red squirrel, a species on which owls do not prey. (B) The owls whose nesting sites are currently being destroyed by the gray squirrels feed primarily on rodents. (C) No indigenous population of any other bind species apart from the endangered owls is threatened by the gray squirrels. (D) The owls that tare threatened build their nests in the tops of trees, but the gray squirrels strip away back from the trunks. (E) The officials’ plan entails adding the poison to food sources that are usually eaten by rodents but not by other animals.
感觉A也对，红松鼠把毒药吃了，就对灰松鼠没有影响了，那还是会对老鹰产生影响。 还有就是B选项 gray squirrels feed primarily on rodents 有点没看懂。 麻烦解释一下。
还有一题是狒狒28题：
28. Ordinary mountain sickness, a common condition among mountain climbers, and one from which most people can recover, is caused by the characteristic shortage of oxygen in the atmosphere at high altitudes. Cerebral edema, a rarer disruption of blood circulation in the brain that quickly becomes life-threatening if not correctly treated from its onset, can also be caused by a shortage of oxygen. Since the symptoms of cerebral edema resemble those of ordinary mountain sickness, cerebral edema is especially dangerous at high altitudes. 有
Which one of the following is an assumption on which the argument depends? (A) The treatment for ordinary mountain sickness differs from the treatment for cerebral edema. (B) Cerebral edema can cause those who suffer from it to slip into a coma within a few hours. (C) Unlike cerebral edema, ordinary mountain sickness involves no disruption of blood circulation in the brain. (D) Shortage of oxygen at extremely high altitude is likely to affect thinking processes and cause errors of judgment. (E) Most people who suffer from ordinary mountain sickness recover without any special treatment.
A选项说红松树把毒药吃了，但并没说灰松鼠就不会吃到那毒药啊~~ B选项“The owls whose nesting sites are currently being destroyed by the gray squirrels feed primarily on rodents. ”说的是owl以rodents为生，因此如果毒药把rodents都毒死的话，那么owls就会因为没有东西可以吃受到威胁
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发表于 2010-1-19 13:41:16
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