257. During an ice age, the buildup of ice at the poles and the drop in water levels near the equator speed up the Earth’s rotation, like a spinning figure skater whose speed increases when her arms are drawn in.
(A) like a spinning figure skater whose speed increases when her arms are drawn in
(B) like the increased speed of a figure skater when her arms are drawn in
(C) like a figure skater who increases speed while spinning with her arms drawn in
(D) just as a spinning figure skater who increases speed by drawing in her arms（E）
(E) just as a spinning figure skater increases speed by drawing in her arms
这里A为什么不对？a spinning figure skater whose speed increases when her arms are drawn in是带定语从句修饰的名词短语啊，复合like后面必须加名词的用法！而且逻辑上似乎与主句的比较更一致，因为：
主句说：the builup of ice and the drop...speed up the Earth's rotation. (即原因导致了结果)
A选项：当her arms are drawn in increases speed (同上)
E选项：通过drawing in her arms increases speed. (为了目的而采取行动，而主句的原因只能是自然发生，而不能被人为来要求发生)
为什么没人理我?非常谢谢Pumpkin MM的答复。总结一下MM的答复，是否可以理解如下：
Like A, B do. 结构是比较名词；(Just) as A do, B do 是比较动作。谢谢！
"(Just) as A do, B do " is wrong, you have to say " (just) as A do, so B do".You can say " B do, (just) as A do".
And the as clause is not for comparison, it is a so called "adverbial clause of manner".
同意以上，补充：
Like A, B do...
B, like A, do...
却没有看到过：B do, like A...
另外，如果最后一种情形出现时，再找到里面有动词/动名词，有很大的嫌疑会是as，表示动作相似性（或整个句子）的比较
刚刚总结到关于AS作为连词时的用法如下：
(由最优选项到最弱选项)
1. Just as A do, so B do...
2. Just as A do, so too + 部分倒装
3. Just as A do, B do...
想请问一下：
1. 以上三种用法中的just是否都可省略？
2. 以上三种用法中，前半句和后半句是否可以互换位置？
3. 以上三种用法中A与B有什么特别要求？
谢谢！
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253.
Dr. Hegsted argues that just
as polio vaccine is given to every person to protect the few who might actually
contract polio, mass dietary change is needed to protect the significant
number who are susceptible to the life-threatening effects of press eating
habits.
(A) just as polio
vaccine is given to every person to protect the few who might actually contract
polio
(B) like polio
vaccine, which is given to every person to protect the few who might contract
polio
(C) similar to
polio vaccine which is given to every person in order to protect the few who
might actually contract polio
(D) while, to
protect the few who might actually contract polio, polio vaccine is given to
every person（A）
(E) similar to the
giving of polio vaccine to every person in order to protect the few who might
contract polio actually
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