题目

以方程组 的解为坐标的点 在平面直角坐标系中的位置是（ ） A . 第一象限 B . 第二象限 C . 第三象限 D . 第四象限 答案：CSo far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.    A. many of which B. many of whom C. many of them D. many of that