The Chinese lunar New Year usually ______ two records: the world's most watched television gala show, and its busiest telecommunications network.

A．develops

B．witnesses

C．establishes

D．launches

一般情况下沟槽宽度不大于2.5m，要求降水深度不大于（）m时，可采用单排井点。

A.5

B.4

C.3

D.6