以下是引用祈晴坊主在2003-9-20 13:26:00的发言: 22. A scientist made three observations: (1) in the world's temperate zones, food is more plentiful in the ocean than it is in fresh water; (2) migratory fish in temperate zones generally mature in the ocean and spawn in fresh water; and (3) migratory fish need much nourishment as they mature but little or none during the part of their lives when they spawn. On the basis of those observations, the scientist formulated the hypothesis that food availability is a determining factor in the migration of migratory fish. Subsequently the scientist learned that in the tropics migratory fish generally mature in fresh water and spawn in the ocean.
Which one of the following would it be most helpful to know in order to judge whether what the scientist subsequently learned calls into question the hypothesis?
(A) whether in the world's temperate zones, the temperatures of bodies of fresh water tend to be lower than those of the regions of the oceans into which they flow
(B) whether the types of foods that migratory fish eat while they inhabit the ocean are similar to those that they eat while they inhabit bodies of fresh water
(C) whether any species of fish with populations in temperate zones also have populations that live in the tropics
(D) whether there are more species of migratory fish in the tropics than there are in temperate zones
(E) whether in the tropics food is less plentiful in the ocean than in fresh water
选E 我觉得B也对的 如果食物不同,那根本就不存在那里多哪里少的问题了
E. scientist base learning on the hypothesis: food availability is determine fact causing migratory fish to migrate. to evaluate this hypothesis, we want to know whether food is really an determine factor. the migratory fish mature in fresh water, if we can know that in the fresh water it has plenty of food ( or less food)then we can judge the hypothesis.
B wrong , because scientist doesn't base his hypothsis on the type of food. if in the observation, it says fish eat only one particular type of food, then B can be a candidate. in this case, fish type = fish availability.
[此贴子已经被作者于2003-9-23 9:52:45编辑过] |