21. Since it lives in the desert, the collared lizard depends from insects for water as well as for food.

　　答案：C

　　改正：depends fromàdepends on

　　分析：這種用法是固定搭配。

　　參考譯文：由于它生活在沙漠，蜥蜴的水源和食物靠的是昆蟲.

　　22. The Texas Panhandle region, in the northwestern part of the state, produces more wheat, cotton, and grain sorghum than any of other area of Texas.

　　答案：D

　　改正：any ofàany

　　分析：any在這里是副詞，可以直接修飾other.

　　參考譯文：德州西北部的狹長(zhǎng)地區(qū)，比德州其他的地方生產(chǎn)更多的小麥，棉花和高梁

　　谷物。

　　23. Light rays what enter the eye must be focused onto a point on the retina in order for a clear visual image to form.

　　答案：A

　　改正：whatàthat

　　分析：what不能引導(dǎo)定語從句。

　　參考譯文：進(jìn)入眼睛的光線必須聚焦在視網(wǎng)膜的一個(gè)點(diǎn)上以便形成一個(gè)清晰的實(shí)像。

　　24. The orangutan’s hands and feet are designed for holding and grasping branches, and its powerful immensely arms enable it to climb and swing in trees without difficulty.

　　答案：C

　　改正：powerful immenselyàimmensely powerful

　　分析：副詞修飾形容詞時(shí)要放在形容詞前面。

　　參考譯文：猩猩的手腳被設(shè)計(jì)用來抓住樹枝，并且它大而有力的胳膊使它能夠輕鬆的

　　在樹上攀爬和搖擺。

　　25. The extraordinary beautiful of orchids makes them the basis of a multimillion dollar floral industry.

　　答案：B

　　改正：beautifulàbeauty

　　分析：of前后始終應(yīng)用名詞成分，而且beautiful不能被形容詞extraordinary修飾。

　　參考譯文：異常美麗的蘭花使他們成為有數(shù)百萬美金的花卉工業(yè)的基礎(chǔ)。

　　26. The Vermont Elememary Science Project, according to its founders, are designed to challenge some of the most widely held beliefs about teaching.

　　答案：B

　　改正：are designedàis designed

　　分析：主謂單復(fù)數(shù)應(yīng)一致。

　　參考譯文：根據(jù)它的創(chuàng)始人，Vermont基礎(chǔ)科學(xué)工程被設(shè)計(jì)用來挑戰(zhàn)一些教學(xué)方面的廣泛信仰

　　27. The number 8.5 is an example of a “mixed number” because it is composing of an integer and a fraction.

　　答案：B

　　改正：composingàcomposed

　　分析：be composed of 是習(xí)慣用法。牢記即可。

　　參考譯文：數(shù)字8.5是帶分?jǐn)?shù)的一個(gè)例子因?yàn)樗�是由一個(gè)整數(shù)和一個(gè)分?jǐn)?shù)組成的。

　　28. If it is kept dry, a seed can still sprout up to forty years after their formation.

　　答案：D

　　改正：theiràits

　　分析：代詞應(yīng)與前面主語a seed一致，故改為its.

　　參考譯文：如果它保持乾燥，一粒種子仍可以在其成型40年后發(fā)芽.

　　29. In The Sociology of Science, now considered a classic, Robert Merton discusses cultural, economy and social forces that contributed to the development of modern science.

　　答案：B

　　改正：economy and socialàeconomic and social

　　分析：平行結(jié)構(gòu)問題。Cultural, social是形容詞，故將economy改為形容詞形式。

　　參考譯文：社會(huì)學(xué)，現(xiàn)在看成一門經(jīng)典，Robert Merton論述了文化，經(jīng)濟(jì)和社會(huì)力量

　　對(duì)現(xiàn)代科學(xué)發(fā)展的貢獻(xiàn).

　　30.Bacteria lived in the soil play a vital role in recycling the carbon and nitrogen needed by plants.

　　答案：A

　　改正：livedàliving

　　分析：living in the soil是后置定語，play是句子的謂語動(dòng)詞。因?yàn)閎acteria是動(dòng)作的發(fā)出者，故使用現(xiàn)在分詞living。

　　參考譯文：生活在土壤中的細(xì)菌在職務(wù)所需的碳氮迴圈扮演了一個(gè)重要的角色.