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请教三道lsat题目，谢谢～～！
16/2/18
18. In experiments in which certain kinds of bacteria were placed in a generous supply of nutrients, the populations of bacteria grew rapidly, and genetic mutations occurred at random in the populations. These experiments show that all genetic mutation is random.
Which one of the following, if true, enables the conclusion to be properly drawn?
(A) Either all genetic mutations are random or none are random.
(B) The bacteria tested in the experiments were of extremely common forms.
(C) If all genetic mutations in bacteria are random, then all genetic mutations in every other life form arc random also.
(D) The kind of environment in which genetic mutation takes place has no effect on the way genetic mutation occurs.
(E) The nutrients used were the same as those that nourish the bacteria in nature.
我选c，但答案是a。为什么的？
16/2/23
23. Asbestos, an almost indestructible mineral once installed as building insulation, poses no health risk unless the asbestos is disturbed and asbestos fibers are released into the environment. Since removing asbestos from buildings disturbs it, thereby releasing asbestos fibers, the government should not require removal of all asbestos insulation.
Which one of the following, if true, most strengthens the argument?
(A) Asbestos poses far less risk to health than does smoking, drug and alcohol abuse, improper diet or lack of exercise.
(B) Asbestos can post a health threat to workers who remove it without wearing required protective gear.
(C) Some kinds of asbestos, when disturbed, pose greater health risks than do other kinds.
(D) Asbestos is inevitably disturbed by building renovations or building demolition.
(E) Much of the time, removed asbestos is buried in landfills and forgotten with no guarantee that it will not be disturbed again
d和e怎么区分啊？好像都有加强的感觉。。。。请解释一下，可以吗？
17/1/4
4. The theory of military deterrence was based on a simple psychological truth, that fear of retaliation makes a would be a aggressor nation hesitate before attacking and is often sufficient to deter it altogether from attacking. Clearly, then to maintain military deterrence, a nation would have to believed to have retaliatory power so great that a potential aggressor nation would have reason to think that it could not defend itself against such retaliation.
If the statements above are true, which one of the following can be properly inferred?
(A) A would-be aggressor nation can be deterred from attacking only if it has certain knowledge that it would be destroyed in retaliation by the country it attacks.
(B) A nation will not attack another nation if it believes that its own retaliatory power surpasses that of the other nation.
(C) One nation's failing to attack another establishes that the nation that fails to attack believes that it could not withstand a retaliatory attack from the other nation.
(D) It is in the interests of a nation that seeks deterrence and has unsurpassed military power to let potential aggressors against it become aware of its power of retaliatory attack.
(E) Maintaining maximum deterrence from aggression by other nations requires that a nation maintain a retaliatory force greater than that of any other nation.
c为什么不对呢？和d怎么区分？？
[em26] |
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