8. 
olitical theorist: The chief foundations of all governments are the legal system and the police force; and as there cannot be a good legal system where the police are not well paid. It follows that where the police are well paid there will be good legal system.
The reasoning in the argument is not sound because it fails to establish that:
(A) many governments with bad legal systems have poorly paid police forces
(B) bad governments with good legal systems must have poorly paid police forces
(C) a well-paid police force cannot be effective without a good legal system
(D) a well-paid police force is sufficient to guarantee a good legal system（D）
(E) some bad governments have good legal systems
我觉得自己没有把该题的充分必要关系弄清楚
10. Rhizobium bacteria living in the roots of bean plants or other legumes produce fixed nitrogen which is one of the essential plant nutrients and which for non-legume crops, such as wheat, normally must be supplied by applications of nitrogen-based fertilizer. So if biotechnology succeeds in producing wheat strains whose roots will play host to Rhizobium bacteria, the need for artificial fertilizers will be reduced.
The argument above makes which one of the following assumptions?
(A) Biotechnology should be directed toward producing plants that do not require artificial fertilizer.
(B) Fixed nitrogen is currently the only soil nutrient that must be supplied by artificial fertilizer for growing wheat crops.
(C) There are no naturally occurring strains of wheat or other grasses that have Rhizobium bacteria living in their roots.
(D) Legumes are currently the only crops that produce their own supply of fixed nitrogen.（E）
(E) Rhizobium bacteria living in the roots of wheat would produce fixed nitrogen.
我选C,我是不是没有把应该反驳的重点找对?
麻烦大家帮我解答
10 文章只讨论没有Rhizobium bacteria 的小麦的固氮问题，是否存在(C)中的小麦与题无关，且原文有normally一词。
8.there cannot be a good legal system where the police are not well paid:
结论 前提
也就是：非P-->非l，取逆否命题就是：l-->p.所以good system是well payed police的充分条件，well payed police是good system的必要条件
请问费希:
为什么无关呢，如果有C中的那种小麦，不就是不用再人造小麦了？
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