针灸用于治疗胆道蛔虫症的主穴是（）。
A.迎香
B.阳陵泉
C.足三里
D.大横
E.阴陵泉
参考答案：A
架空线路的重复接地对雷电流有分流作用，有助于改善防雷性能。
-----Did you watch the basketball match yesterday?
-----Yes, I did. You know, my brother ________ in the match.
A．is playing
B．was playing
C．has played
D．had played
