5.Large quantities of lead dust can be released during renovations in houses with walls painted with lead-based paint. Because the dust puts occupants at high risk of lead poisoning, such renovations should be done only in unoccupied houses by contractors who are experienced in removing all traces of lead from houses and who have the equipment to protect themselves from lead dust. Even when warned. however. many people will not pay to have someone else do renovations they believe they could do less expensively themselves. Therefore, Homeowners' Journal should run an article giving information to homeowners on how to reduce the risk of lead poisoning associated with do-it-yourself renovation.
5. Which one of the following, if true, argues most strongly against the passage's recommendation about an article?
(A) Most homeowners know whether or not the walls of their houses are painted with lead-based paint, even if the walls were painted by previous owners.
(B) Most people who undertake do-it-yourself renovation projects do so for the satisfaction of doing the work themselves and so are unlikely to hire a professional to do that sort of work.
(C) Whenever information on do-it-yourself home renovation is published. many people who would otherwise hire professionals decide to perform the renovations themselves, even when there are risks involved.
(D) in many areas. it is difficult to find professional renovators who have the equipment and qualifications to perform safely renovations involving lead dust.
(E) When professionally done home renovations are no more expensive than do-it-yourself renovations, most people choose to have their homes renovated by professionals.
为什么选c啊,我选的是a.
11. Logging industry official: Harvesting trees from old-growth forests for use in manufacture can reduce the amount of carbon dioxide in the atmosphere, since when large old trees die in the forest they decompose., releasing their stored carbon dioxide. Harvesting old-growth forests would, moreover, make room for rapidly growing young trees, which absorb more carbon dioxide from the atmosphere than do trees in old-growth forests.
Which one of the following, if true, most seriously weakens the official's argument?
(A) Many old-growth forests are the home of thousands of animal species that would be endangered if the forests were to be destroyed.
(B) Much of the organic matter from old-growth trees, unusable as lumber, is made into products that decompose rapidly.
(C) A young tree contains less than half the amount of carbon dioxide that is stored in an old tree of the same species.
(D) Much of the carbon dioxide present in forests is eventually released when wood and other organic debris found on the forest floor decompose.
(E) It can take many years for the trees of a newly planted forest to reach the size of those found in existing old-growth forests.
我选E,答案是B,为什么啊
15. A certain experimental fungicide causes no harm to garden plants, though only if it is diluted at least to ten parts water to one part fungicide. Moreover, this fungicide is known to be so effective against powdery mildew that it has the capacity to eliminate it completely from rose plants. Thus this fungicide, as long as it is sufficiently diluted, provides a means of eliminating powdery mildew from rose plants that involves no risk of harming the plants.
Which one of the following is an assumption on which the argument depends?
(A) There is not an alternative method, besides application of this fungicide. for eliminating powdery mildew from rose plants without harming the plants.
(B) When the fungicide is sufficiently diluted. it does not present any risk of harm to people, animals. or beneficial insects.
(C) Powdery mildew is the only fungal infection that affects rose plants.
(D) If a fungicide is to be effective against powdery mildew on rose plants, it must eliminate the powdery mildew completely.
(E) The effectiveness of the fungicide does not depend on its being more concentrated than one part in ten parts of water.
答案是E,B为什么不行啊?
谢谢哪位帮我看看.
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