路基防护与加固设施主要有（）。
A、边坡坡面防护
B、沿河路堤河岸冲刷防护与加固
C、湿软地基的加固
D、改善施工工艺
参考答案：A, B, C
The country's railway system has launched online ticket-booking and a real-name ticket purchasing system, and _______ requires passengers to provide their ID numbers when buying tickets.
A．which
B．that
C．what
D．this
“没有什么能够阻挡，你对自由的向往”是许巍的哪首歌的歌词？
