[求助]请教紫皮OG11的题目

下面几题我没有太大的把握,想问问大家是怎么分析的

1 although she had signed a pledge of abstinence while being an adolescent, Frances Willard was 35 years old before she chose to become a temperance activist

A  while being an adolescent

E as an adolescent

请问这句话是什么意思，我对Ａ和Ｅ举棋不定…

２　Ｍs.Chambers is among the forecasters who predict that the rate of addition to arable lands will drop while those of loss rise

答案是the rate of loss rises．　虽然用平行和主谓一致做对了，但是对这句话的意思理解不是很有把握．请教一下大家咯！

３　two new studies indicate that many people become obese more due to the fact that their bodies burn calories too slowly than overeating

D because their bodies burn calories too slowly than because they eat too much

E because of their bodies burning calories too slowly than because of their eating too much

答案是Ｄ，可我选了Ｅ．because of 和because有什么区别吗？除了because of 接名词，because是连词，引导状语从句。

1. A的这种说法很少见到，其错误可以理解为：sign pledge是一个瞬间动作, being ... 表示一段时间，相互不agree。从concise和correct的角度上讲，E是最好的。

这句话大致上说，虽然她在青少年时就签了禁欲的承诺书，但直到35岁才成为一个禁欲的倡导者。其实做题时不用理解整句的意思。

2,3还没做到，hehe

2题：前面是the rate of...,后面不能用those of来代the rates of.这种用法经常考到，是错的。because of不能跟doing这种形式，只能是名词。且用because更简洁，且用because的话后面跟动词，动词优于名词。。。