真心求教 ，万分感谢。替代和指代的问题。

hyykrissy

希望有人能够帮助我解答我的疑惑，每一个看这个帖的人都心想事成。

我在复习OG SC的时候，对于替代和指代产生了很模糊，一团糟的情况，
希望你们能够帮助我 谢谢！！！！！！万分万分感谢，希望不要嫌弃我。

真心真心感谢

OG13 SC21
The commission has directed advertisers to restrict the use of the word “natural” to foods that do not contain color or flavor additives，chemical preservatives，or nothing that has been synthesized.
(B) or that has been
……解释说这个that指代前面的FOODs 所以不对。为什么that直接跳到指代前面的foods呢，而不是就近的chemical preservatives呢。
我知道语义说不通，但我想了解 that 的指代，到底是指代哪个位置？怎么判断它是指代什么？


OG13 SC27
None of the attempts to specify the causes of crime explains why most of the people exposed to the alleged causes do not commit crimes and, conversely why so many of those not so exposed have.
   
(A) have
(B) has
(C) shall
(D) do
(E) could

答案的这个do，替代的是什么？是commit crimes吗？ 那not so exposed后是不是省略了 to the alleged causes？

3.
OG13 SC42
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
答案D
would have to know a great deal more than they do now about the social and economic
这个 than they do 的do 是指代know吗，那比较的是 省略了的宾语？

4.
OG13  RC22
But such predation on a dominant or potentially dominant species occurs in systems that do as well as in systems that do not have species that play keystone roles.
第一个that作用是什么？后面的do是指代occur还是do have species that play keystone roles的省略？ As well as链接的是什么？

hyykrissy

有人吗

hyykrissy

company profits resulting from such innovations may be reinvested in that company with no guaratee that the company will continue to make further improvements in ecoefficiency  。

这里的that company 是指代的第一个company吗
那这里的三个company都是指的一个company吗？

我知道我问题很多。。。。。希望有好心人出来帮帮忙

hyykrissy

请问谁能帮助一下我吗！万分感谢！！！