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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】考查動詞的被動語態。

【解析】“癌癥的原因”應該是“被”揭開，故應用被動語態; 另外，從句意上看，此處應用現在進行時。

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】考查非謂語動詞用法。

【解析】由于title與give之間為被動關系，故用過去分詞。

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】考查情態動詞辨析與用法。

【解析】must在此表示堅持或固執，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】考查狀語從句。

【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間都用來看電視了，還能學什么東西呢?

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】考查賓語從句的連接詞及強調句。

【解析】本題干相當于I just wonder what makes him so excited.的意義，所以該題實際上為強調句型的特殊疑問句式，what為賓語從句的連接詞且在從句中做主語，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】考查非謂語動詞用法。

【解析】根據句中的since可知，此處應用完成式，故可排除C和D。根據句意，missing(不見，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】考查短語動詞辨析與用法。

【解析】take up 在此表示“開始(學習或從事等)”。如：He dropped medicine and took up physics. 他放棄學醫，開始學物理。For a long time I had wanted to take up writing. 很久以來我一直想從事寫作。

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.hz123456.com/)。

【考點】考查介詞短語辨析。

【解析】in nature 意為“本質上”“事實上”; in return 意為“作為報答”; in turn 意為“依次”; in fact意為“事實上”。根據句意，顯然只有B最恰當。

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