lsat-2-4-2.LSAT-2-4-4.LSAT-2-4-7

2. The teeth of some mammals show “growth rings” that result from the constant depositing of layers of cementum as opaque bands in summer and translucent bands in winter. Cross sections of pigs teeth found in an excavated Stone Age trash pit revealed bands of remarkably constant width except tat the band deposited last, which was invariably that the band deposited last, which was invariably translucent, was only about half the normal width.

The statements above most strongly support the conclusion that the animals died

(A) in an unusually early winter

(B) at roughly the same age

(C) roughly in midwinter

(D) in a natural catastrophe

(E) from starvation

答案C,能不能帮我理一下思路,我看的不是很懂.

4. Giselle: The government needs to ensure that the public consumes less petroleum. When things cost more, people buy and use less of them. Therefore, the government should raise the sales tax on gasoline, a major petroleum product.

Antoine: The government should not raise the sales tax on gasoline. Such an increase would be unfair to gasoline users. If taxes are to be increased, the increases should be applied in such a way that they spread the burden of providing the government with increased revenues among many people, not just the users of gasoline.

As a rebuttal of Giselle’s argument, Antoine’s response is ineffective because

(A) he ignores the fact that Giselle does not base her argument for raising the gasoline sales tax on the government’s need for increase revenues

(B) he fails to specify how many taxpayers there are who are not gasoline users

(C) his conclusion is based on an assertion regarding unfairness, and unfairness is a very subjective concept

(D) he mistakenly assumes that Giselle wants a sales tax increase only on gasoline

(E) he makes the implausible assumption that the burden of increasing government revenues can be more evenly distributed among the people through other means besides increasing the gasoline sales tax

答案A,有点疑惑,我觉得GISELLE正是base her argument for raising the gasoline sales tax on the government’s need for increase revenues,与答案相反啊?

7. Marine biologists have long thought that variation in the shell color of aquatic snails evolved as a protective camouflage against birds and other predators. Brown shells seem to be more frequent when the underlying seafloor is dark-colored and white shells more frequent when the underlying seafloor is light-colored. A new theory has been advanced, however, that claims that shell color is related to physiological stress associated with heat absorption. According to this theory, brown shells will be more prevalent in areas where the wave action of the sea is great and thus heat absorption from the Sun is minimized, whereas white shells will be more numerous in calmer waters where the snails will absorb more heat from the Sun’s rays.

Evidence that would strongly favor the new theory over the traditional theory would be the discovery of a large majority of

(A) dark-shelled snails in a calm inlet with a dark, rocky bottom and many predators

(B) dark-shelled snails in a calm inlet with a white, sandy bottom

(C) light-shelled snails in an inlet with much wave action and a dark, rocky bottom

(D) light-shelled snails in a calm inlet with a dark, rocky bottom and many predators

(E) light-shelled snails in a calm inlet with a white, sandy bottom and many predators

答案D,我觉得有点问题,它可以说明旧的观点不对,但我觉得怎么能说明新的观点对了,它没有讲到吸收阳光啊.