∵a≥-1，
∴a+1≥0，
∴(a+1)2=|a+1|=a+1，
故答案为：a+1．
.Was ______ Alice, ______ played the piano very well, ______ helped me with my English?
A．it;whom;that
B．this;who;who
C．it;that;that
D．it;who;that
法兰规格：135/8″-5M346.4，2FZ35-35封井器的钢圈环号（）。
A.BX158
B.BX159
C.BX160
D.R73（RX73）
