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发布时间：2006-06-23 11:55     点击：

(C) assumes that the United States government does not place a high value on its natural resources

(D) refrains from using slanted language concerning the level of federal expenditures

(E) compares state expenditures with federal expenditures

5. Animals with a certain behavioral disorder have unusually high level of aluminum in their brain tissue. Since a silicon-based compound binds to aluminum and prevents it from affecting the brain tissue. Animals can be cured of the disorder by being treated with the compound.

The argument is based on which one of the following assumptions?

(A) Animals with the disorder have unusually high but invariable levels of aluminum in their brain tissue.

(B) Aluminum is the cause of the disorder rather than merely an effect of it.

(C) Introducing the compound into the brain tissue has no side effects.

(D) The amount of the compound needed to neutralize the aluminum in an animal's brain tissue varies depending upon the species.

(E) Aluminum is never present in normal brain tissue.

6. As air-breathing mammals. Whales must once have lived on land and needed hind limbs capable of supporting the mammals' weight. Whales have the bare remnants of a pelvis. If animals have a pelvis, we expect them to have hind limbs. A newly discovered fossilized whale skeleton has very fragile hind limbs that could not have supported the animal's weight on land. This skeleton had a partial pelvis.

If the statement above are true, which one of the following, if also true, would most strongly support the conclusion that the fragile hind limbs are remnants of limbs that land-dwelling whales once had?

(A) Whale bones older than the fossilized hind limbs confirm that ancient whales had full pelvises.

(B) No skeletons of ancient whales with intact hind limbs capable of supporting the mammals' weight have ever been found.

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