青年男性，阴囊肿大，摸到睾丸。透光试验阳性。可能是
A．股疝B．腹股沟直疝C．腹股沟斜疝D．睾丸鞘膜积液
参考答案：D
No one knows when such a custom first _____.[ ]
A. came into power
B. came into being
C. came true
D. came out
丰富知识，增长才干的主要途径是[ ]
A．学习
B．交友
C．交往
D．玩耍
