能够使数字在星星框中完整填满的文字工具可以是哪些（）
A.a
B.b
C.ab
D.abc
参考答案：C
My good friend is an English man. _____ name is Tony. [ ]
A. His
B. He
C. Her
简述低钙血症的诊断要点和处理方法。
