7．at　[考查固定短语的用法。at the same time意为“同时”，是一个常用介词短语。]

　　8．goes　[考查动词的时态。这是一篇说明文，主要介绍了土坯房冬暖夏凉的原理，故用一般现在时态。]

　　9．natural　[考查形容词的用法。修饰名词architects，故要用形容词形式。]

　　10．how　[考查宾语从句的连接词用法。分析句子结构可知，这是一个宾语从句。根据形容词thick及结构可知这里的意思是印第安人要算出土坯墙的确切厚度。所以答案为how。]

　　Passage 6　(2017·新课标全国)

　　阅读下面材料3个单词)或括号内单词的正确形式

　　Are you facing a situation that looks impossible to fix?

　　In 1969，the pollution was terrible along the Cuyahoga River near Cleveland，Ohio.It __1__ (be) unimaginable that it could ever be cleaned up.The river was so polluted that it __2__(actual) caught fire and burned.Now，years later，this river is one of __3__ most outstanding examples of environmental cleanup.

　　But the river wasnt changed in a few days __4__ even a few months.It took years of work __5__ (reduce) the industrial pollution and clean the water.Finally，that hard work paid off and now the water in the river is __6__(clean) than ever.

　　Maybe you are facing an impossible situation.Maybe you have a habit __7__ is driving your family crazy.Possibly you drink too much or don’t know how to control your credit card use.When you face such an impossible situation，dont you want a quick fix and something to change immediately?

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