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se buildings increase the friction on air flowing around them。 This friction tends to slow the speed of winds; making them far less efficient at dispersing pollutants。 On the other hand; air turbulence increases because of the effect of skyscrapers on airflow。 Rainfall is also increased in cities。 The cause appears to be in part greater turbulence in the urban atmosphere as hot air rises from the built…up surface。

Question: Cities create climatic conditions of their own through their physical structure and urban activities。

Answer Choices

1。 The amount of heat produced in a city will be reduced when cities use the heat from cars to warm houses。

2。 The built up landscape of the city readily bees a heat island; with greater water runoff and special climatic conditions such as low relative humidity and increased air turbulence。

3。 The materials from which cities are built and the effects of pollution domes help make urban areas warmer than rural areas。

4。 Cities tend to be warmer than their surrounding areas; in part because they produce heat by burning fuel for heating; powering vehicles; and industrial production。

5。 In most cities; the heating that results from solar radiation is intensified by carbon dioxide; a gas that is present at very high concentrations in cities’ atmospheres。

6。 During periods without rainfall; the air in cities heats up and causes winds to slow down with the result that pollutants are not dispersed。

阅读题干,可以知道题目要求选出符合“城市自身结构和城市活动会形成其自身的气候条件”这一说法的选项。

观察选项,第一项的意思是“城市产生的热量会受因汽车的使用等因素影响”,而这只是支持“城市活动会影响气候”这一观点的一个细节,没有概括地谈及气候的形成,因此不符合题意;

第二项主要讲的是“城市地貌特征很容易形成热岛”,是对文章最后两段的总结,因此符合题意;

第三项讲的是“城建材料和污染会使城市比农村更温暖”,是文章第三段提到的“两个影响气候的因素”的其中一个,因此

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