能够适应“钟摆式”的交通流的道路横断面类型是( )。
A．一块板
B．两块板
C．三块板
D．四块板
参考答案：A
Nowadays, no single country can successfully________the global problems alone.[ ]
A. make use of
B. deal with
C. come up with
D. go through
高劳动生产率的途径有哪些？
