田野：小麦：麦粒A．水塘：鲤鱼：鱼籽 B．林场：树木：枯枝 C．牧场：牛群：牛尾 D

咸味的主要化学成分是（）

A.氯化钠

B.氧化钠

C.谷氨酸钠

D.碳酸钙

软件项目开发成本的估算依据，通常是开发成本估算模型。常用的模型主要有： ① IBM模型 ② Putnam 模型 ③基本COCOMO 模型 ④ 中级COCOMO 模型 ⑤ 高级COCOMO 模型其中( ) 均是静态单变量模型。

A．①②

B．②④⑤

C．①③

D．③④⑤

男，54岁。间歇上腹部不适4年，餐后加重，嗳气。胃液分析结果；基础胃酸分泌量(BAO)为0(正常值1～2mmol/h)，最大胃酸分泌量(MAO)为5mmol/h(正常值17～23mmol/h)，壁细胞总数(PCM)为2.5×10 8个。下列疾病诊断最可能为

A．胃癌

B．胃溃疡

C．慢性萎缩性胃炎

D．十二指肠球部溃疡

E．慢性浅表性胃炎

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.

15（）

A.charge

B.take

C.cost

D.spend