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    35. It is not yet well understood _______ has made the rainforest disappear year by year.

    　　 A. what　　　　 B. which　　　　 C. that　　　　　　 D. how

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    34. Most of what has been said about the Browns _______ also true of the Dicksons.

    　　 A. are　　　　　 B. is　　　　　　 C. being　　　　　 D. to be

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    33. --Hi, Johnson, l'm thinking of taking five courts in literature next term.

    　 --Well, wouldn't four be __________?

    　　 A. wiser　　　　 B. wise　　　　　 C. the wisest　　　 D. the wiser

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