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【单选题】

Directions: There are 10 blanks in the following passage. For each numbered blank, there are 4 choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.
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 1 like Shakespeare’s birthplace or Stonehenge (巨石阵) are literally being worn away by millions of foreign feet. The 2 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 3 in the house of the Bard, however, where tourists want to enter the actual building.
Overcrowding in cities, towns and villages is 4 problem. Traffic jams are an outcome. In narrow roads, tourist vehicles cause congestion. 5 traders and residents cannot get around to do their work. Car parks fill up, 6 strangers park their cars where they can: in streets, across gateways, in lay-bys, or even in 7 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 8 by another half million who populate the city daily in the tourist 9 —eight million visits each year. The mayor recently decided to 10 visitors to 90,000 a day: the only way to save the city from overcrowding. Directions:ANSWER SHEET

A.
residence
B.
dwellings
C.
monuments
D.
sites
题目标签:磨损石阵巨石阵
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举一反三

【单选题】引起缸套过度磨损的原因():

A.
活塞过热,密封不好
B.
燃油、滑油中含有硫
C.
冷却水温度过低

【多选题】导致滚动轴承早期磨损的原因是()。

A.
润滑不良
B.
装配过紧
C.
装配过松
D.
装配在椭圆变形的轴颈上

【单选题】电器触头的主要磨损是()。

A.
机械磨损
B.
化学磨损
C.
电磨损
D.
磨料磨损

【多选题】气缸磨损是不均匀的,其正常磨损的特点有

A.
在第一道活塞环上止点顶边稍下处缸壁磨损量最大
B.
活塞环上止点以上的缸壁几乎没有磨损
C.
气缸轴线方向上呈上大下小的不规则锥形磨损
D.
最大磨损发生在气缸中部

【单选题】气缸磨损的特点是

A.
上小下大,圆形磨损
B.
上小下大,锥形磨损
C.
上大下小,锥形磨损
D.
上大下小,圆形磨损

【多选题】刀具磨损的主要原因有( )

A.
磨粒磨损
B.
粘结磨损
C.
扩散磨损
D.
相变磨损