21. On May 20,1932, Amelia Earhart became the first woman fly solo across the Atlantic Ocean.

　　答案：C

　　考點：後置定語。

　　分析：the first woman後面是定語而不是謂語，不能用動詞原形fly，而應用flying，或to fly。解題要點: the first…to do…是TOEFL常考習語。

　　22. Translated into terms of psychological theory, association has been thought of as the basis of to learn, conditioning, and creative thinking.

　　答案：C

　　考點：詞形/並列結(jié)構(gòu).

　　分析：介詞of後不能加不定式(to learn),而應加動名詞。此外，後文and要求兩邊同詞性、同性質(zhì)，因此，應當用learning與conditioning和thinking並列。

　　23. The Statue of Liberty was originally proposed in 1865 to commemoration the alliance of France with the American colonies during the American Revolution.

　　答案：C

　　考點：詞性

　　分析：(C)前面的to是動詞不定式的符號，而commemoration是名詞，此處應用動詞commemorate。

　　解題要點：名詞尾碼-tion形式出現(xiàn)在TOEFL改錯題中，應首先考慮其詞性的對錯。

　　24. Reptiles are widely distributed all over the world, but are much abundant in warm regions and are virtually absent beyond the treeline in the Arctic.

　　答案：B

　　考點：more和much常被錯用。

　　分析：記住more十形容詞原級構(gòu)成比較級。根據(jù)句意，此處應以more abundant與後文absent比較。

　　25. Alike light waves, microwaves may be reflected and concentrated.

　　答案：A

　　考點：like和alike的用法。

　　分析：這兩個詞經(jīng)常相互用錯。alike的詞性是形容詞或副詞，而like可以是介詞。此處需用介詞like。

　　解題要點: like或alike出現(xiàn)在TOEFL考題中，應當予以首先考慮。

　　26. Industrial buyers are responsible for supplying the goods and services that an organization required for its operations.

　　答案：D

　　考點：時態(tài)一致。

　　分析：以不劃線的are做線索，看出本句的基本時態(tài)是現(xiàn)在時，講述的是一般性的事實。故此處不應用過去時，required應為require.

　　27. The most easiest process for mining gold is panning, which involves using a circular dish with a small pocket at the bottom.

　　答案：A

　　考點：最高級。

　　分析：遇到含有形容詞最高級的題時，既要注意the和-est或most是否缺失，也要注意-est和most是否重複使用。此處most多餘。

　　28. Farm animals have been regardless by nearly all societies as a valuable economic resource.

　　答案：B

　　考點：詞性/被動語態(tài)。

　　分析：看到系動詞be和by同時出現(xiàn)，應注意二者之間劃線的詞是否過去分詞。此處regardless(形容詞)應為regarded.

　　29. Although it is any longer the big business that it was in the forties, radio continues to be a medium of essential communication, especially at the local level.

　　答案：A

　　考點：習語/no和any的用法。

　　分析：no longer是固定說法，用在肯定句中。any longer則用在否定句和疑問句中。(A)前是肯定的it is，故此處用no longer。

　　30. The field of dynamics in physics is concerned with a particle’s motion in relation to the forces acting it.

　　答案：D

　　考點：缺詞。

　　分析：act為及物動詞時意為“扮演(角色)”，而此處意為“起作”，應為不及物動詞，不能直接加賓語。應為acting on/upon it。