— It is said that the cycling race around the Qinghai Lake was very hard.

— So it was. Only a handful of cyclists made _______.

A．one

B．it

C．that

D．them

顶板管理内容包括（）。

A.合理选择施工方法

B.严格执行有关工程质量标准

C.巷道断面选用圆弧顶