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问题 单项选择题

货币局制度和美元化最主要的差异是（）。

A.实施货币局制度的国家放弃了铸币税，但美元化的国家没有；

B.美元化的国家放弃了铸币税，但实施货币局制度的国家没有；

C.美元化国家中，该国货币由美元提供100%的支持，但在货币局制度中，美元支持的比例不到100%；

D.与美元化相比，货币局制度是对固定汇率更严格的承诺。

答案

参考答案：B

实验题

现有以下仪器，请回答下列问题：

(1)仪器⑤的名称是__________；取用粉末状固体必须用到的仪器是___________(填序号)。

(2)如果用加热高锰酸钾的方法制取氧气，制气装置（即反应装置）应选仪器_________(填序号)；收集氧气的方法有___________和_______________。

(3)如果用过氧化氢溶液分解来制取氧气，制气装置（即反应装置）最好选用仪器_________(填序号)；其文字表达式为：______________________。

(4)比较(2)和(3)两种制取氧气的方法，最好选用方法(3)的原因是_____________。

(5)把上面分解KMnO4制取氧气的仪器装配好后，检验该装置气密性的操作方法为：_____________。

(6)实验室里用加热高锰酸钾的方法制取氧气，并用排水法收集氧气实验时，待气泡放出时，不宜立即收集，其原因是________________；应待___________时，再收集。实验结束时应先把导管___________，后熄灭_________，原因是_______________；集满氧气的集气瓶应__________放在桌上并盖上玻璃片。

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单项选择题

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.

5（）

A.superb

B.super

C.exceptional

D.superior
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