蓝书上329页 76题

chongov · 发表于 2010-11-6 12:59:23

76. Unless tiger hunting decreases, tigers will soon be extinct in the wild. The countries in which the tigers' habitats are located are currently debating joint legislation that would ban tiger hunting. Thus, if these countries can successfully enforce this legislation, the survival of tigers in the wild will be ensured. The reasoning in the argument is most vulnerable to criticism on the grounds that the argument
正确答案（E）takes the removal of an impediment to the tigers' survival as a guarantee of their survival
我的选项（A）assumes without sufficient warrant that a ban on tiger hunting could be successfully enforced
E选项的意思是否是说“除人为猎杀外，还有其他事物对老虎的生存构成威胁”？

sdcar2010 · 发表于 2010-11-6 20:31:47

In the statement "Unless tiger hunting decreases, tigers will soon be extinct in the wild", since it uses the word "unless", "banning tiger hunting" is only a necessary condition for tigers' survival, not a sufficient condition or guaranteed condition!

The phrases (then, only, only if, only when, must, required, unless, except, without, until) introduce a necessary condition.

The phrases (if, when, whenever, every, all, any, people who, in order to) introduce a sufficient condition.

chongov · 发表于 2010-11-7 11:38:56

原来是必要不充分和充分不必要的问题啊，谢谢

蓝书上329页 76题

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