题目

Much of our food comes from _______.     A. plants   B. air      C. books        D. computers 答案: A10.在数轴上表示下列各数,并用“<”号连接.$-2,2\frac{1}{4},3.5,-0.5,0,-1\frac{3}{4},4\frac{1}{2},-4$.
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