人类在进化过程中取得的重大进步是[ ]
A．直立行走
B．语言的产生
C．火的使用
D．制造和使用工具
答案：D
At the foot of Yuelu Mountain ____, which is one of the most famous middle schools in China. [ ]
A. does our school lie
B. does lie our school
C. our school lies
D. lies our school
必须按规定对煤矿井下采掘工作面进行巡回瓦斯检查或（）检查。
