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以下是引用joywzy在2003-7-22 15:16:00的发言：
帮我看看这两个完成句子,好吗?
9. It is not known whether bovine spongiform encephalopathy (BSE), a disease of cattle invariably deadly to them, can be transmitted directly from one infected animal to another at all stages of the infection. If it can be, there is now a reservoir of infected cattle incubating the disease. There are no diagnostic tests to identify infected animals before the animals show overt symptoms. Therefore, if such direct transmission occurs, the disease cannot be eradicated by ____
Which one of the following best completes the argument?
(A) removing from the herd and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE
(B) developing a drug that kills the agent that cause BSE, and then treating with that drug all cattle that might have the disease
(C) destroying all cattle in areas where BSE occurs and raising cattle only in areas to which BSE is known not to have spread
(D) developing a vaccine that confers lifelong immunity against BSE and giving it to all cattle, destroying in due course all those animals for which the vaccine protection came too late
(E) developing a diagnostic test that does identify any infected animal and destroying all animals found to be infected
答案:A,我选了C,这题我做了好久,在A,C中考虑,结果还是错了.
Joywzy, 个人之陋见：
做这种句子完成题时，一定要认真读懂整个题干的推导，因为这种题类似于归纳题。
这道题里假设一种情况成立， 也就是“感染”在“出现症状”前。
所以选项A --- 在病牛出现“症状”后，才把病牛移走或“人道毁灭” 对病情的控制是无济于事的， 因为病牛在出现症状前就已经把病毒传给了其它的牛一样。
打个比方， 就象前一段时间的SARS， 当某个SARS病人在出现咳嗽，发烧等情况后才被隔离， 但这个时候他可能已经把病传给了其他人。
24. When the rate of inflation exceeds the rate of return on the most profitable investment available, the difference between those two rates will be the percentage by which, at a minimum, the value of any investment will decline. If in such a circumstance the value of a particular investment declines by more than that percentage. It must be true that________
Which one of the following logically completes the argument?
(A) The rate of inflation has risen.
(B) The investment in question is becoming less profitable.
(C) The investment in question is less profitable than the most profitable investment available.
(D) The rate of return on the most profitable investment available has declined.
(E) There has been a change in which particular investment happens to be
答案:C,我选了B,我觉得B更好点,因为原文没有讲到 the most profitable investment?
这道题其实是一道数学题， 其中有一个差值：
也就是“通涨率”（设为I）和“最高的投资回报率”（设为A max）之间的差值， 换句话说， 这个差值有点象 benchmark
=> benchmark = I - A max. （at a minimum, the value of any investment will decline）
我们解读为： A decline Min = I - A max
题干中说到：
If in such a circumstance the value of a particular investment declines by more than that percentage
我们可以解读为： A decline > A decline Min
即 A decline > I - A max
不难得出，I - A > I - Amax
==> A < A max
谢谢了.
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发表于 2003-7-22 12:34:00
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