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fernandochang

这几题就是不懂!求高人指点!
LUXIN CRITICAL REASONING LOOSE-LEAFING
27.People whose bodies cannot produce the substance cytochrome P450 are 3 times as likely to develop Parkinson’s disease, a disease that affects the brain, as are people whose bodies do produce this substance. Since cytochrome P450 protects the brain from toxic chemicals, tocis chemicals probably play a role in the development of Parkinson’s disease.

Which of the following, if true, most strongly supports the argument?

(A)It will soon be possible for cytochrome P450 to be synthesized for the treatment of people whose bodies cannot produce this substance.
(B)Many people whose bodies are unable to produce cytochrome P450 lack the ability to produce certain other substances as well.
(C)Cytochrome P450 has no effect on the brain other than to protect it from toxic chemicals.
(D)People with Parkinson’s disease often exhibit a marked lessening in the severity of their symptoms when they are treated with dopamine a chemical produced naturally in the brain.
(E)Many people with Parkinson’s disease have the ability to produce cytochrome P450 naturally.
A):C   

28. Stone Age potters crafted complicated and often delicate ceramic pots, tools, and jewelry. They also crafted crude pottery figurines. Many of the delicate ceramic pots, tools, and jewelry have been found intact or nearly so, whereas, the figurines, crafted at roughly the same time as the ceramics, have largely been found in tiny fragments.

Which of the following, if true, best explains why few of the pottery figurines, but many of the delicate ceramics, have been found intact?

(A)When a pottery piece from any batch was broken during finishing, Stone Age people sometimes deliberately smashed the rest of that batch, perhaps to avert bad luck.
(B)The composition of clay, which affects the durability of any pottery made from it, varies greatly from one area of the world to another.
(C)Pottery was invented in the Stone Age, and techniques for making pottery were mastered well before those required for delicate ceramic work.
(D)Stone Age potters crafted pottery figurines as frequently as they did ceramic pieces.
(E) Many Stone Age rituals involved the destruction of a pottery figurine, perhaps as a sacrifice to the gods.
A):A

29. A ten-year comparison between the US and the Soviet Union in terms of crop yields per acre revealed that when only planted acreage is compared, Soviet yields are equal to 68 percent of US yields. When total agricultural acreage (planted acreage plus fallow acreage) is compared, however, Soviet yield is 114 percent of US yield.

From the information above, which of the following can be most reliably inferred about US and Soviet, agriculture during the ten-year period?

(A)A higher percentage of total agricultural acreage was fallow in the US than in the Soviet Union.
(B)The US had more fallow acreage than planted acreage.
(C)Fewer total acres if agricultural land were fallow in the Soviet Union than in the US.
(D)The Soviet Union had more planted acreage than fallow acreage.
(E)The Soviet Union produced a greater volume crops than the US produced.
A):A

30.Scientist: More than 1,000 large asteroids regularly cross the Earth’s path. Even though the probability of one colliding with the Earth is extremely slight, we should do whatever we can to reduce that probability since any such collision would be catastrophic. The best way to avoid such a disaster is to deflect the asteroids. The only known way of deflecting asteroids is by hitting them with nuclear weapons that would be stored in space stations.

The scientist’s claims are structured so as to lead to which of the following conclusions?

(A)Nuclear technology is the only technology that can plausibly be used to prevent natural catastrophes.
(B)Nuclear weapons should be deployed in space.
(C)No catastrophe has yet been caused by the collision of an asteroid with the Earth.
(D)The 1,000 large asteroids that cross the Earth’s path pose only an extremely slight risk of colliding with the Earth.
(E)There is currently no acceptable use to which nuclear weapons can be put, aside from protecting the Earth from asteroids.
A):B

wdzc

27。 身体不能产生cytochrome P450 的人比身体能产生cytochrome P450的人3倍可能得Parkinson’s disease.而cytochrome P450能保护大脑不受toxic chemicals的影响。结论说toxic chemicals可能引起Parkinson’s disease的发生。如果说cytochrome P450还能保护大脑不受其他物质的影响的话，那也有可能说是其他物质导致了Parkinson’s disease的发生。C选项在这里排除了其他的可能。