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 |