明长城的东端起于[ ]
A．鸭绿江
B．辽东
C．山海关
D．嘉裕关
答案：A
We really hope the sunny weather ________ for Saturday's tennis match.
A．keeps up
B．picks up
C．takes up
D．comes up
简述铸态管插口浇不足如何处理？
