新出版一题

Another One：

16. A new technique for extracting residues of oil from existing oil wells by using lignins, a by-product of papermaking, is profitable provided that oil prices are over 20 dollars a barrel. Since oil prices are rising, investors looking for companies with prospects for rapid growth in profits would be wise to invest in paper manufacturers, whose currently almost worthless by-product will soon be a profit-boosting commodity.

Which of the following, if true, most seriously weakens the argument above?

(A) A small quantity of lignins are currently sold by paper manufacturers to chemical companies, but most of the lignins produced are burnt as waste.

(B) The 20-dollar-a-barrel oil price as a threshold of profitability for using lignins allows for the increased cost of refining crude oil that has been  extracted using lignins.

(C) Only one-half to two-thirds of the total oil in a well can be extracted using conventional techniques of pumping and flooding with water.

(D) Petroleum-based substances that can be used as a substitute for lignins in extracting oil are costly and are made from oil, and these substances therefore increase in price as oil increases in price.

(E) The quantity of lignins produced annually in the manufacture of paper is several times larger than the amount that is likely to be useful in the oil industry.

我看E是support 吗，怎会是答案？

10. Rheumatic fever is the most serious complication of streptococcal infection, but rheumatic fever is not itself an infection. Rheumatic fever occurs only when, in defending against streptococcal infection, the body’s immunological system produces antibodies that also attack the cells of the heart and kidneys.

Which of the following, if true, would contribute most to an explanation of why only streptococcal bacteria give rise to rheumatic fever?

(A) Only certain strains of streptococcal bacteria are associated with rheumatic fever.

(B) The antibodies that the body produces to control a streptococcal infection can attack cells of the mucous membranes.

(C) Antibiotics have not proved as effective against streptococcal infections as they have against some other bacterial infections.

(D) Streptococcal bacteria are the only bacteria that are structurally similar to the cells of the body attacked in rheumatic fever.

(E) Rheumatic fever can be misdiagnosed if it is not preceded by a serious streptococcal infection.     ans: D

为何STRUCTURALLY SIMILAR 能做答案； 我觉得答案不严密阿