Bank depositors in the United States are all financially protected against bank failure because the government insures all individuals’ bank deposits．An economist argues that this insurance is partly responsible for the high rate of bank failures，since it removes from depositors any financial incentive to find out whether the bank that holds their money is secure against failure．If depositors were more selective．then banks would need to be secure in order to compete for dositors’ money．
46． Which of he following，if true，most seriously weakens the economist s argument?
(A) Before the government started to insure depositors against bank failure，there was a lower rate of bank failure than there is now．
(B) When the government did not insure deposits frequent bank failures occurred as a result of depositors’ fears of losing money in bank failures．
(C) Surveys show that a significant proportion of depositors are aware that their deposits are insured by the government．
(D) There is an upper limit on the amount of an individual's deposit that the government will insure．but very few individuals’ deposits exceed this limit．
(E) The security of a bank against failure depends on the percentage of its assets that are loaned out and also on how much risk its loans involve．
答案是B，但是我怎么觉得这个E有点他因削弱的意思呢？
Note that the economist's argument is that the insurance is partly responsible for the high rate of bank failures. He does not assert that the insurance is the solely responsible. Therefore, providing alternative reason, as (E) does, cannot weaken the economist's argument. After all, the economist's conclusion does not exclude other reasons. Therefore (E) is incorrect.
明了了，多谢
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