路拱
参考答案：
为保证路面上的雨水及时排除，减少雨水对路面的浸湿和渗透，路面表面应做成两边低、中间高的路拱。
--Do you need any help, Lucy?
--Yes. The job is ________ I could do myself.
A．not more than
B．less than
C．more than
D．no more than
