[求助]GWD 4 里面的 3道题， 似懂非懂中 ：（

Community activist: 
If Morganville wants to keep its central shopping district healthy, it
should prevent the opening of a huge SaveAll discount department store on the
outskirts of Morganville.  Records from
other small towns show that whenever SaveAll has opened a store outside the
central shopping district of a small town, within five years the town has
experienced the bankruptcies of more than a quarter
of the stores in the shopping district.

The answer to which of the following would be most useful
for evaluating the community activist’s reasoning?

1. Have
        community activists in other towns successfully campaigned against the
        opening of a SaveAll store on the outskirts of their towns?
2. Do a
        large percentage of the residents of Morganville currently do almost all
        of their shopping at stores in Morganville?
3. In towns with healthy central shopping
        districts, what proportion of the stores in those districts suffer
        bankruptcy during a typical five-year period?
4. What
        proportion of the employees at the SaveAll store on the outskirts of
        Morganville will be drawn from Morganville?
5. Do
        newly opened SaveAll stores ever lose money during their first five years
        of operation?

第一题，提干是如果If Morganville wants to keep its central shopping district healthy, 那么it必须 prevent the opening of a huge SaveAll discount department store on the outskirts of Morganville。如果人们本来就不去M购物的话，那这个必须就不成立了……反正本来就要倒了，和开不开SaveAll就没关系了

Q38，结论是说是Tufe的环境变了才导致两者高度变了。但从逻辑上推，可能是Tufe变了也可能是mainland变了，所以前提必须保证mainland没有变，才能推出是tufe变了的结论。D的话……assumption是Tufe变了，结论是Tufe变了……这个字说自话的呀……

Q14，weaken，所以就是说其实那些1930年以前的房子并没有质量比较好。为啥呢？因为1930年前造的质量不好的都倒了，倒了现在自然看不见了，也没有办法去评判好还是不好了。