[单选题]DN1000钢筋混凝土排水管道工程开挖，基础采用混凝土基础90°，管道基础宽1.4m，根据施工组织设计设置挡土板，则沟槽开挖底宽应为（ ）m
A.1.4
B.2
C.2.4
D.2.9

The development of writing was one of the great human inventions. It is difficult (51) many people to imagine language without writing; the spoken word seems intricately tied to the written (52) .
But children speak (53) they learn to write. And millions of people in the world speak languages with (54) written form. Among these people oral literature abounds, and crucial knowledge (55) memorized and passed (56) generations. But human memory is short-lived, and the brain’s storage capacity is finite. (57) overcame such problems and allowed communication across the miles (58) through the years and centuries. Writing permits a society (59) permanently record its poetry, its history and its technology.
It might be argued (60) today we have electronic means of recording sound and (61) to produce films and television, and thus writing is becoming obsolete. (62)