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. 答案是B. E不对吗? 有毒的食物都被rodent吃了,没被其他动物吃(包括squirrel),不也是削弱了吗????
9. Astronauts who experience weightlessness frequently get motion sickness. The astronauts see their own motion relative to passing objects, but while the astronauts are weightless their inner ears indicate that their bodies are not moving. The astronauts’ experience is best explained by the hypothesis that conflicting information received by the brain about the body’s motion causes motion sickness. Which one of the following, if true, provides the strongest additional support for the hypothesis above? (A) During rough voyages ship passengers in cabins providing a view of the water are less likely to get motion sickness than are passengers in cabins providing no view. (B) Many people who are experienced airplane passengers occasionally get motion sickness. (C) Some automobile passengers whose inner ears indicate that they are moving and who have a clear view of the objects they are passing get motion sickness. (D) People who have aisle seats in trains or airplanes are as likely to get motion sickness as are people who have window seats. (E) Some astronauts do not get motion sickness even after being in orbit for several days. 答案是A.但我觉得A把less改成more才对呢????不明白不明白.............
The astronauts see their own motion relative to passing objects, but while the astronauts are weightless their inner ears indicate that their bodies are not moving. The astronauts’ experience is best explained by the hypothesis that conflicting information received by the brain about the body’s motion causes motion sickness. 这句话不是再说:宇航员依据周围物体感知移动,但是,当他们失重的时候,内耳感知不移动. A说,有物体,不易患病.没有物体,容易患病. 这不是反了吗?有物体,能感知到移动,但内耳感知的是不移动,所以容易患病啊?????
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发表于 2010-8-8 23:31:49
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