至2000年世界人口第二大国是（ ）
A．美国
B．中国
C．印度
D．巴西
答案：C
I don't know if he () tomorrow. If he ()tomorrow, please ring me up.
A．comes; comes
B．will come; will come
C．will come; comes
D．comes; will come
UE在什么情况下会发生TAU更新？请画出2种TAU流程
