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问题 单项选择题

国体决定政体、政体反映国体。我国是人民民主专政的社会主义国家，我国的根本政治制度是( )。

A．民主集中制

B．人民代表大会制

C．单一制

D．三权分立制

答案

参考答案：B

单项选择题

Increasingly, the development of tourism is seen to have an effect on the environment. Erosion (磨损) is one problem. The steps and stones of major popular (51) like Shakespeare’s birthplace or Stonehenge (巨石阵) are literally being worn away by millions of foreign feet. The (52) in the case of Britain’s best known prehistoric monument has been to use railings to keep visitors at a distance. Such measures can hardly be (53) in the house of the Bard, however, where tourists want to enter the actual building.

Overcrowding in cities, towns and villages is (54) problem. Traffic jams are an outcome. In narrow roads, tourist vehicles cause congestion. (55) traders and residents cannot get around to do their work. Car parks fill up, (56) strangers park their cars where they can: in streets, across gateways, in lay-bys, or even in (57) driveways. This causes obstruction. The sheer weights of in-comers can be a hazard. Thus Venice, a city built for half a million inhabitants, is (58) by another half million who populate the city daily in the tourist (59) —eight million visits each year. The mayor recently decided to (60) visitors to 90,000 a day. the only way to save the city from overcrowding.

60().

A.reduce 

B.permit 

C.recruit 

D.limit
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多项选择题

立方氮化硼（CBN）刀具适于加工（）。

A、高硬度淬火钢

B、高速钢（HRC62）

C、铝合金

D、铜合金

E、高硬度工具钢
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