题目

______ by a greater demand of vegetables, farmers have built more green houses. A. Driven             B. Being driven             C. To drive        D. Having driven 答案：A1．已知集合M={x|x2-1≤0}，N={x|-2＜x＜1，x∈Z}，则M∩N（　　）A．{-1，0}B．{1}C．{-1，0，1}D．∅