人体含量最多的金属宏量元素是（）
A.铁
B.钙
C.铜
D.锌
E.钠
参考答案：B
如图中，有两颗人造地球卫星围绕地球运动，它们运行的轨道不可能是______．
People were excited to see _____ could act perfectly (完美地) at Beijing Olympic Opening Ceremony. [ ]
A. such little a girl
B. such a little girl
C. so a little girl
D. such an little girl
