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Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria. Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria. The statements above, if true, provide the most support for which of the following conclusions? A. Mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way.（可以推出的）（这是must be true题，选项必须全部来自原文的，选项中出现了题干中未出现的信息，some other way，这不一定的，sufficient也不好的） B. Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections. C. In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.（这个是可以从原文中推理出来的，因为原文是个 没有m的老鼠不会N上升，有M的会上升的 ，结论是M在里面其作用 原文是个小概念，而结论是个大概念，在must be true中，小概念对，大概念也必然对的） D. When a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouse’s body decreases. E. Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection 和 15. Many people argue that tobacco advertising plays a crucial role in causing teen-agers to start or continue smoking. In Norway, however, where there has been a ban on tobacco advertising since 1975, smoking is at least as prevalent among teen-agers as it is in countries that do not ban such advertising. 有人认为广告在cause teenagers to start or continue smoking 方面其作用的 而在Norway 有ban的更没有ban的as prevalent as Which of the following statements draws the most reliable conclusion from the information above? (A) Tobacco advertising cannot be the only factor that affects the prevalence of smoking among teen-agers.（可以推出的） (B) Advertising does not play a role in causing teen-agers to start or continue smoking.（太绝对了，可能有影响的） (C) Banning tobacco advertising does not reduce the consumption of tobacco.（可能会的，虽然是一样流行，但是如果没有，说不定更加严重） (D) More teen-agers smoke if they are not exposed to tobacco advertising than if they are（.
A (E) Most teen-agers who smoked in 1975 did not stop when the ban on tobacco advertising was implemented.
115 Since no information is given about what effect, if any, the Norwegian ban on tobacco advertising had on teenage smoking in Norway, none of choices B through E can be concluded, since each makes some claim about the effects of tobacco advertising, or of banning such advertising, on teenage smoking or on tobacco consumption. 紫色的解释是我看了帖以后自己的理解诶
这2道题的A选项好像也有点相似，一道选了，一道却没选 为什么 请各位大N们指教 | 
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发表于 2009-4-25 23:18:00
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