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28. Although the causes of cancer _______, we do not yet have any practical way to prevent it. (2006山東卷)

A. are being uncovered                    B. have been uncovering   

C. are uncovering                              D. have uncovered

【答案】A。

【考點(diǎn)】考查動(dòng)詞的被動(dòng)語(yǔ)態(tài)。

【解析】“癌癥的原因”應(yīng)該是“被”揭開(kāi)，故應(yīng)用被動(dòng)語(yǔ)態(tài); 另外，從句意上看，此處應(yīng)用現(xiàn)在進(jìn)行時(shí)。

29. Five people won the “China’s Green Figure” award, a title _______ to ordinary people for their contributions to environmental protection. (2006山東卷)

A. being given     B. is given             C. given                 D. was given

【答案】C。

【考點(diǎn)】考查非謂語(yǔ)動(dòng)詞用法。

【解析】由于title與give之間為被動(dòng)關(guān)系，故用過(guò)去分詞。

30. —May I smoke here?

—If you _______, choose a seat in the smoking section. (2006山東卷)

A. should             B. could                 C. may                   D. must

【答案】D。

【考點(diǎn)】考查情態(tài)動(dòng)詞辨析與用法。

【解析】must在此表示堅(jiān)持或固執(zhí)，又如：After I gave her my advice，she must go and do the opposite. 在我給她出主意之后她偏反著干。

31. How can you expect to learn anything _______ you never listen? (2006山東卷)

A. in case             B. even if               C. unless              D. when

【答案】D。

【考點(diǎn)】考查狀語(yǔ)從句。

【解析】when在此表示“既然”，又如：How can they learn anything when they spend all their spare time watching television? 他們把所有的空閑時(shí)間都用來(lái)看電視了，還能學(xué)什么東西呢?

32. I just wonder _______ that makes him so excited. (2006山東卷)

A. why it does      B. what he does   C. how it is            D. what it is

【答案】D。

【考點(diǎn)】考查賓語(yǔ)從句的連接詞及強(qiáng)調(diào)句。

【解析】本題干相當(dāng)于I just wonder what makes him so excited.的意義，所以該題實(shí)際上為強(qiáng)調(diào)句型的特殊疑問(wèn)句式，what為賓語(yǔ)從句的連接詞且在從句中做主語(yǔ)，句意為：我想知道什么使得他如此興奮。

33. Police are now searching for a woman who is reported to _______ since the flood hit the area last Friday. (2006山東卷)

A. have been missing                       B. have got lost    C. be missing       D. get lost

【答案】A。

【考點(diǎn)】考查非謂語(yǔ)動(dòng)詞用法。

【解析】根據(jù)句中的since可知，此處應(yīng)用完成式，故可排除C和D。根據(jù)句意，missing(不見(jiàn)，失蹤)比用lost(丟失，迷失)更合適。

34. After he retired from office, Rogers _______ painting for a while, but soon lost interest. (2006山東卷)

A. took up            B. saved up          C. kept up             D. drew up

【答案】A。

【考點(diǎn)】考查短語(yǔ)動(dòng)詞辨析與用法。

【解析】take up 在此表示“開(kāi)始(學(xué)習(xí)或從事等)”。如：He dropped medicine and took up physics. 他放棄學(xué)醫(yī)，開(kāi)始學(xué)物理。For a long time I had wanted to take up writing. 很久以來(lái)我一直想從事寫作。

35. A clean environment can help the city bid for the Olympics, which _______ will promote its economic development. (2006山東卷)

A. in nature          B. in return            C. in turn               D. in fact

【答案】B(http://www.52ysedu.com/)。

【考點(diǎn)】考查介詞短語(yǔ)辨析。

【解析】in nature 意為“本質(zhì)上”“事實(shí)上”; in return 意為“作為報(bào)答”; in turn 意為“依次”; in fact意為“事實(shí)上”。根據(jù)句意，顯然只有B最恰當(dāng)。

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