這句話中what 不可以換成as,因為what在此是關(guān)系代詞：what=that wich所...的事物；而as作為關(guān)系代詞時的意思是“這一點”,即as=which不過我在詞典上看到過： 12 is to 4 as 4 is to 1這個句子。但是考試的時候， 選項既有WHAT 又有AS， 答案是WHAT。what=that wich as=which就是說as只有what的部分功能，as無法取代whatIntellect is to the mind what sight is to the body. 智力與大腦的關(guān)系就像視力與身體一樣。(The relation) Intellect is to the mind (is) what.智力與大腦的關(guān)系就像那種關(guān)系一樣。The relation和 Intellect is to the mind是同位語關(guān)系-----> 而what=the relation which=that which，可見what中包含了代詞that，which所指代的內(nèi)容做了that的同位語(The relation ) Intellect is to the mind (is) the relation which.智力與大腦的關(guān)系就像那種關(guān)系一樣。-----> 再用that這個代詞代替the relation(The relation) Intellect is to the mind (is) that which.智力與大腦的關(guān)系就像那種關(guān)系一樣。-----> 就是：(The relation) Intellect is to the mind (is) that sight is to the body.而用as=which的話就成了：(The relation) Intellect is to the mind (is) which.=(The relation) Intellect is to the mind (is) sight is to the body.可以發(fā)現(xiàn)，主句中的那個重要的、代替了The relation這個概念的表語代詞that是不存在的，卻只有that的同位語的sight is to the body，問題就像是撿了芝麻卻丟了西瓜一樣了。至于你說的： 12 is to 4 as 4 is to 1這個句子，若有的話，就套用為：(The relation) Intellect is to the mind (is) as sight is to the body.可以發(fā)現(xiàn)，as引導(dǎo)了表語從句。與what不同的是，sight is to the body不再是同位語，而變成了表語，但句子的意思沒有變化?？傊@道題出得不好。以上是個人拙見，僅供參考。謝謝你，我是在《英漢大詞典》上看到AS的用法里有一條是 two is to four as eight is to sixteen.這個例子的，至于您解釋的WHAT的用法，我非常贊同，只是我看到了幾道考試真題，選項明明也是數(shù)字的比例關(guān)系，選項中既有WHAT又有AS， 但是卻選了WHAT，我想知道不選AS的原因，不知道有沒有權(quán)威點的解釋，您總結(jié)的非常好，謝謝。