立案的程序为获取案源和立案审批两个步骤。
参考答案：对
缺铁性贫血（）
A.大细胞性贫血
B.正细胞性贫血
C.小细胞正色素性贫血
D.小细胞低色素性贫血
E.大细胞低色素性贫血
Do you know that the first textbooks written for teaching English as a foreign language ____ in the 16th century?
A．came up
B．came along
C．came out
D．came about
