分析一下这两题的ETS规律

189. Proponents of artificial intelligence say they will be able to make computers that can understand English and other human languages, recognize objects, and reason as an expert does—computers that will be used to diagnose equipment breakdowns, deciding whether to authorize a loan, or other purposes such as these.

(C) like an expert—computers that will be used for such purposes as diagnosing equipment breakdowns or deciding whether to authorize a loan

(A)  of being dwellings that must also operate as businesses

(B)  of dwellings that must also operate like business

(C)  that they are dwellings that must operate like business

(D)  that, as dwellings, they must also operate like businesses（A）

(E)   to be a dwelling that must also operate as a business

这两道题目比较一下, 我真搞不懂什么时候用like什么时候用as 了,  做罢189, 好象201中的B是正确的呀,  而且of being.... 多不简洁

看了看lzm说句末就用like更是晕头转向了

dell兄总能看到问题所在。不知道你的201是什么题号，好像应该是大全226，补充126。

operate as是惯用法。通过题号你可以查到大牛们的讨论。

http://forum.chasedream.com/dispbbs.asp?boardID=23&replyID=104959&ID=15540&skin=1

http://forum.chasedream.com/dispbbs.asp?BoardID=23&replyID=151349&id=21262&star=1&skin=0

as 一般用成作为的意思.

like 指想像.

computers  不能 as expert

operate as businesses 指本身固有businesses 属性

这两题，即便不知道as 和like的用法区别，也是可以做出来的：第一题，通过后面的平行结构；第二题，通过单复数一致和that从句。

as 和like的用法，已经讨论过很多次了。

在第一题中，个人认为",like 名词"结构中like前面有逗号，则不可以放在句尾；本题中没有逗号，故形式上可以。意思上，我一开始也希望as 可以； 但是：

*****************引用GMEJ*********************

另外，在通过平行，做出的答案却是as，我想是因为：as an expert does，中的does无法指代前面的三个动词：understand, recognize , and reason，应该改为can与前面的can平行。

第二题中，as可以解释为“作为”，介词短语修operate；坦白说，我也认为如果加助动词后，解释为“像。。一样”的意思也可以，但是还要考虑其他方面：单复数一致和that从句。

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谢谢诸位, 明白了

1. 第二题中AS是作为介词出现的, 表示作为....

2. 关于as 和 like用于对动作相似性的比较时,

a. as 的含义为"as A does sth, so b does." "正如A...., B...." 而助动词一定要补出,别更多的强调动作的相似

b. like 的含义为"象....那样...."更强调两逻辑主语的相似性

like