上海失业保险领取必须办理失业登记与求职登记吗？怎么领取？
参考答案：
是的，办理失业登记与求职登记是上海失业保险领取必要的一道程序。
Tony used to _______ to school, but he is used to _______ to school now. [ ]
A. walk; taking a bus
B. walked; took a bus
C. walk; take a bus
水生维管束植物有哪4大生态类群，各举1-2例。
