《中华人民共和国国民经济和社会发展第×个五年规划纲要》编制工作中的思路研究阶段的主要工作有（）。

A.开展中长期评估

B.征求对草案的意见

C.开展重大课题的研究

D.广泛听取意见

E.加强专项规划工作

The initial tunnels were just ___________ the surface of the ground. People were transported in carriages, which were ___________ the narrow tunnels by steam engines.

A．under, broken through

B．below, put through

C．of , gone through

D．beneath, pulled through