题目

All of the flowers now raised here have developed from those _______ in the forest. A. once they grew B. they grew once    C. they once grew D. once grew   答案：C我国面积最大和最小的省区是（ ）A．内蒙古自治区和宁夏回族自治区B．新疆维吾尔自治区和澳门特别行政区C．四川省和北京市D．西藏自治区和上海市