又有三个问题，盼望众大虾指点迷津
1.It is an oversimplified view of cattle raising to say that [U]all one has to do with cattle is leave them alone while they feed themselves , corral them, and to [/U]drive them to market when the time is ripe.
答案是all one has to do with cattle is leave them alone while they feed themselves and then corral them and
可是我觉得也有问题。all one has to do里应有that引导来修饰ALL。而且，....is do也不对啊，应用....is to do。
我选了the only thing that has to be done with cattle is ......
2.[U]After the Colonial period's 50 percent mortality rate life expectancy improved for children, but [/U]as late as the nineteenth century about one child in three died before reaching the age of six.
答案是Although life expectancy for children improved after the Colonial period ,during which the mortality rate was 50 percent.
可是我选的是Despite children's life expectancy improvement from the Colonial period's 50 percent mortality rate,这个答案有什么不好呀
3.In the face of widespread concern about environmental waste,compact disc manufacturers are attempting to find a replacement for [U]the disposable plastic box in which [/U]they package their product.
这就是答案。可我的答案是the disposable plastic boxes in which to
我觉得box用复数好象更好点，从句里用不定式也更简练些。
考虑并列，应该作为首要的分析元素。
若是不定式的话，应该是
compact disc manufacturers are attempting to find a replacement for the disposable plastic box to package their product in
用which 干吗呢？
