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    PART TWO: LANGUAGE KNOWLEDGE （45分）
    Section A （15分）
    Directions: Beneath each of the following sentences there are 4 choices marked A, B, C and D. Choose one answer that best completes the sentence.
    21. Trees are useful to man mainly in three ways, the most important of which is that they can protect ______ from droughts (干旱) and floods.
    A. it         B. itself          C. himself         D. Him
    D
    略
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