1、Throughout most of their lives, humans _____ learn and increase their mental capacity.

　　A. actually　　B. readily　　C. fairly　　D. primarily

　　[答案] B. readily

　　[注釋]readily (=with no difficulty)容易地；They can readily be bought anywhere. (這些東西在任何地方都能容易地買到。)

　　actually 實(shí)際上；fairly 公平地；相當(dāng)，劃算；primarily主要地，首先；根本上。

　　2、Through exposure to air, water, and organic matter, rocks _____ changes known as weathering.

　　A. undergo　　B. transform　　C. undertake　　D. suspend

　　[答案] A. undergo.

　　[注釋]undergo (=experience esp. suffering or difficulty) 經(jīng)受：1)She underwent a thorough examination at the hospital. (她在醫(yī)院接受了全面的檢查。)2)The travelers underwent many difficulties. (這些旅行者經(jīng)受了許多困難。)

　　undertake (=take up a [position]; start on [work]) 從事，負(fù)責(zé)(某事)：1)He undertook the responsibility for changes. (他負(fù)責(zé)對(duì)各種變化作出安排。)2)At first we could only undertake repair jobs.(起初我們只能干修理活。)3)We shall undertake the construction of this bridge. (我們將負(fù)責(zé)這座橋的修建工作。)

　　transform 改變；suspend吊，懸掛；推遲，暫定。

　　本題譯文：由于暴露于空氣、水和有機(jī)物，巖石經(jīng)受了稱之為風(fēng)化的變化。

　　3、She tried to _____ out of the window to see the procession more clearly.

　　A. bend　　B. lean　　C. bow　　D. slope

　　[答案] B. lean.

　　[注釋]lean vi. 倚，靠；lean out of the window(倚著窗戶探出身去)，lean against a tree(背倚靠著樹)，lean back in a chair (坐在椅子上背向后傾)，lean on a desk(靠在桌上)，指胸對(duì)桌子。

　　4、The problem had become _____ in his mind, and he could not decide what to do about it.

　　A. simplified　　B. exaggerated　　C. matured　　D. isolated

　　[答案] B. exaggerated.

　　[注釋]exaggerate(=say or believe more than the truth about sth.)夸張，夸大：It was a rabbit, not a lion. You are exaggerating as usual. (這是一只兔子，不是獅子。你經(jīng)常夸大事實(shí)。)

　　simplify 簡(jiǎn)化；mature使成熟；isolate使孤立。

　　本題譯文：這個(gè)問(wèn)題在他頭腦里夸大了，因此他無(wú)法決定該怎么辦。