艾滋病的最主要传播途径是（）
A.性接触传播
B.注射途径传播
C.母婴传播
D.器官移植
E.人工授精
参考答案：A
It is said that ______ regularly is good for us, for we can know whether we are healthy or not. [ ]
A. examined
B. examining
C. being examined
D. having examined
