人类最基本的实践活动是（）
A.改造自然的生产实践
B.变革社会的实践
C.探索世界规律的科学实验活动
D.国家方针政策的制定
参考答案：A
某村庄有若干个供水站，已知任意两个供水站之间的距离都相等，问该村庄最多应该有多少个供水站
A．2B．3C．4D．5
The early railroads were connected short lines in the existing arteries of transportation: roads, turnpikes, canals, and other waterways.
A. short lines that connected B. those short fines connectedC. connected by short lines D. short connected lines
