精索静脉曲张可引起下列哪种情况（）
A.输卵管闭塞导致不育
B.输尿管狭窄
C.影响生精功能导致不育
D.输精管闭塞导致不育
E.以上都不是
参考答案：C
He said he would pick me up at the school gate. However, he ______ yet. [ ]
A. didn't arrive
B. doesn't arrive
C. isn' t arriving
D. hasn't arrived
公共控制信道（CCCH）分为（）.
A.寻呼信道（或PCH）
B.随机接入信道（或RACH）
C.接入允许信道（或AGCH）
D.独立专用控制信道（或SDCCH）
