根据《城镇燃气设计规范》，向压缩天然气储配站和压缩天然气瓶组供气站运送压缩天然气的气

与一国经济的开放程度有关的因素中，最关键的是( )。

A．资源禀赋
B．国家大小
C．经济制度的性质
D．经济政策

二次型的标准型为（）。

A．A

B．B

C．C

D．D

下列关于绩效评价中定期评价的表述，正确的是()。

A．定期评价比阶段性评价全面

B．定期评价应在单项工程完成后进行

C．定期评价很难对项目功能特性作出评价

D．定期评价可以对工程未完成部分进行综合评价

路基填土宽度每侧应比设计规定宽（）m。

A.0.1

B.0.2

C.0.5

D.1.5

Throughout the 19th century and into the 20th, citizens of the United States maintained a bias against big cities. Most lived on farms and in small towns and believed cities to be centres of (1) , crime, poverty and moral (2) Their distrust was caused, (3) , by a national ideology that (4) farming the greatest occupation and rural living (5) to urban living. This attitude (6) even as the number of urban dwellers increased and cities became an essential (7) of the national landscape. Gradually, economic reality overcame ideology. Thousands (8) the precarious (不稳定的) life on the farm for more secure and better paying jobs in the city. But when these people (9) from the countryside, they carried their fears and suspicions with them. These new urbanities, already convinced that cities were (10) with great problems, eagerly (11) the progressive reforms that promised to bring order out of the (12) of the city.

One of many reforms came (13) the area of public utilities. Water and sewerage systems were usually operated by (14) governments, but the gas and electric networks were privately owned. Reformers feared that the privately owned utility companies would (15) exorbitant (过渡的) rates for these essential services and (16) them only to people who could afford them. Some city and state governments responded by (17) the utility companies, but a number of cities began to supply these services themselves. (18) of these reforms argued that public ownership and regulation would (19) widespread access to these utilities and guarantee a (20) price.

（3）（）

A. by origin

B.in part

C. at all

D. at random