请教几道逻辑（2）

liflyy · 发表于 2003-6-15 23:54:00

6. according to a recent cross-cultural study, married people in general have longer life expectancies than do people who divorce and do not remarry. this fact indicates that the stress associated with divorce adversely affects health.
Q: weaken
A: (a) adults who have never married have shorter life expectancies than do married people of the same age
文中没有提到未结婚的人，而且说的是离婚，我倒认为是无关选项。

7. hotco oil burners, designed to be used in asphalt plants, are so efficient that hotco will sell one the the clifton asphalt plant for no payment other than the cost savings between the total amount the asphalt plant actually paid for oil using its former burner during the last two years and the total amount it will pay for oil using the hotco burner during the next two years. on installation, the plant will make an estimated payment, which will be adjusted after two years to equal the actual cost savings.
Q: a disvantage for HOTCO of the plan
A: a steady increase in the price of oil beginning soon after the new burner is installed.
这道题看不懂，不知道怎样得到这个答案？

8. if it is true that the streets and th sidewalks are wet whenever it is raining, which of the following must als be true?
A: if it is not raining, streets and sidewalks are not wet.

是不是所有逆否命题中，IF 和主句的内容都不可调换。如IF STREET AND SIDEWALKS ARE WET不能改为 IF IT IS NOT RAINING。
if the streets and sidewalks are wet, it is raining. 书上说这是逆命题，为什么说是逆命题。

请教几道逻辑（2）

请教几道逻辑（2）

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