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　　(E) works just as well as does a commonly used blood-thinning drug, which is also more expensive, at preventing blood clots

　　比較，對(duì)主謂賓結(jié)構(gòu)的句型主語(yǔ)比較，需要補(bǔ)出助動(dòng)詞，注意助動(dòng)詞的形式、單復(fù)數(shù)及時(shí)態(tài)。

　　簡(jiǎn)潔有效，修飾名詞以形容詞最為簡(jiǎn)潔，盡量保持原句的修飾方式，由名詞改為定語(yǔ)從句使得句子??嗦。

　　(A) 正確，aspirin與blood-thinning drug在prevent blood clots上的比較，does指代prevents，補(bǔ)出以避免歧義。

　　(B) a commonly used and a more expensive中的第二個(gè)冠詞a多余，使得句意變化，成為兩種drug。

　　(C) 助動(dòng)詞will應(yīng)該為does，因?yàn)樵溆玫囊话悻F(xiàn)在時(shí)prevents則不是將來時(shí)態(tài)。

　　(D) works at prevention of…的表達(dá)方式??嗦;缺少助動(dòng)詞does。

　　(E) works at preventing…的表達(dá)方式??嗦;which引導(dǎo)定語(yǔ)從句修飾drug??嗦，不如直接用形容詞作定語(yǔ)。

　　補(bǔ)充說明：比較-主語(yǔ)比較

　　1、對(duì)主謂賓全的句型主語(yǔ)比較：A do sth than B do.(AB為對(duì)等名詞，加do是為了顯示這是一個(gè)可以發(fā)出動(dòng)作的名詞，因而確定是主語(yǔ)，進(jìn)而確定是主語(yǔ)對(duì)比)。時(shí)態(tài)要據(jù)后定。There be 句型等同于一般的主謂賓俱全的句型。

　　主語(yǔ)若相同，可省，但助動(dòng)詞不能省。如：

　　As a result of the continuing decline in the birth rate, [fewer people] will enter the labor force [in the 1980’s+ than (few people省略)did *in the 1960’s and 1970’s+, a twenty-year period during which people born after the war swelled the ranks of workers.

　　2、對(duì)只有主謂(如果主語(yǔ)有定語(yǔ)成分，必須要that/those來指代)，沒有賓語(yǔ)的句子，因?yàn)闆]有賓語(yǔ)，只可能有主語(yǔ)比較，因而不需要重復(fù)do來確認(rèn)這是一個(gè)可發(fā)出動(dòng)作的主語(yǔ)，所以其比較形式如下：

　　I eat faster than you.注意與下句區(qū)別 I eat apple faster than you do 如果寫成 I eat apple faster than you 按GMAC的理解，從語(yǔ)法上就變成我吃蘋果比吃你快，成了賓語(yǔ)比較。邏輯上顯然不通。

　　3、主系表結(jié)構(gòu)的比較與主謂結(jié)構(gòu)相同。如果時(shí)態(tài)不一致，則需補(bǔ)出助詞，如：

　　The economy of Florida is more diversified than it was ten years ago

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　　代詞

　　代詞pronoun簡(jiǎn)稱pron是代替名詞的一種詞類。大多數(shù)代詞具有名詞和形容詞的功能。

　　1. 代詞的分類:

　　主格： I, you, she, he, it , we, they , who

　　賓格： me, you, him , her, it, us, them, whom

　　形容詞性: this that those these

　　2. 代詞的注意事項(xiàng):

　　原則： 每一個(gè)代詞都必須有一個(gè)確定的先行詞。GMAT不適用帶有性別的代詞;所以仔細(xì)看代詞 it/its/they/them/their.

　　原則： 每一個(gè)代詞都必須在數(shù)量上和他的先行詞保持一致

　　排除： 代詞和名詞在確定為名詞是代詞的邏輯語(yǔ)義后;數(shù)量上保持不一致的

　　原則： 當(dāng)從句的主語(yǔ)是一個(gè)代詞的時(shí)候，那么這個(gè)代詞的先行詞會(huì)是主句的主語(yǔ);當(dāng)有兩個(gè)并列句的時(shí)候，第二句話的主語(yǔ)是一個(gè)代詞，那么這個(gè)代詞的先行詞就是第一句話主語(yǔ)。

　　Eg. Because it was robbed last month, the door to the house is locked. 錯(cuò)誤

　　“It” is the subject of the dependent clause, so it must be illogically referring to “door”

　　暗示： 當(dāng)你注意到這些線索的時(shí)候，注意觀察代詞和先行詞是否保持一致。代詞問題;

　　當(dāng)你每次看到一個(gè)代詞的時(shí)候，必須要找到他的先行詞;

　　3. 代詞問題

　　3.1一致性問題

　　代詞必須和前面的指代內(nèi)容保持單復(fù)數(shù)，性別上的一致 指代對(duì)象是單數(shù)，單詞是單數(shù); 指代對(duì)象是復(fù)數(shù)，代詞也是復(fù)數(shù)。

　　The Glass House Mountains in Queensland, Australia, were sighted in 1770 by the English navigator Captain James Cook, bv whom they were named supposedly because its sheer wet rocks glistened like glass.

　　① who so named them supposedly because their

　　② who so named it since supposedly their

　　答案是A 一個(gè)什么樣的山(mountain),別人用他命名。。。。這里的it,或者them指代前面的mountains。所以要要復(fù)數(shù)them，而不能b中單數(shù)謂語(yǔ)it

　　2) In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair due to moisture exhaled bv tourists, which raised its humidity to such levels so that salt from the stone was crystallizing and fungus was growing on the walls.

　　a. due to moisture that tourists had exhaled, thereby raising its humidity to such levels that salt from the stone would crystallize

　　b. because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing