The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles. 支持这句话 就要解释seasonal variation对 young voles的影响，AE涉及了，但E更能解释
这个选项几乎是原句“treating these documents not as treaties with sovereign nations requiring ratification by the Senate but simply as legislation to be passed by both houses of Congress.
关于so as to和so that在字面上的区别。so…that可以用作多个主语时，so前面的主语和that后面的主语可以不一样，例如：
I set up the computer so that they could work from home.（我把电脑设置好，这样他们就可以在家办公了。）
so as to要求so前的主语和as to身后动作的主语相同。例如：
I set up the computer so as to do my work. （我把电脑设置好以便完成我的工作）
此时，do my work的主语必须是I。
1. 并不是“比较”the number of people和“去年的增长”，而是the number of people发出了“造成两倍”这个动作。
当“非数字物体（即，这个名词本身没有纯粹的数字概念，例如dogs、cats等绝大多数名词）”比较时，我们通常会用double(twice) as much as或double(twice) as many as，例如：
twice as many dogs
double as much water
但是，当“数字”比较时，我们不能加as many或as much，例如：
twice the increase
double the decrease
显然地，增长和下降本身就是数字的概念。因此，不能用double as much as the increase of。
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The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles. 支持这句话 就要解释seasonal variation对 young voles的影响，AE涉及了，但E更能解释