C．In Chicago，the temperature reached 100 degrees for four days.

　　D．Washington hit 100 on Sunday for the fourth day.

　　答案　C　[细节理解题。根据第一段可知A项正确；根据第二段第一句话可知B项正确；根据第五段第二句话可知C项错误；根据第五段最后一句话可知D项正确。只有C项符合题目要求，故选C。]

　　50．The underlined word “sustained” in the second paragraph probably means ______.

　　A．continuous

　　B．divided

　　C．added

　　D．reduced

　　答案　A　[词义猜测题。根据前面的the first cool day after 11 days可知应选A。]

　　51．Which cities have temperatures reaching 100 degrees?

　　A．Washington，Chicago

　　B．Chicago，St Louis

　　C．St Louis，Washington

　　D．Washington，Chicago，St Louis

　　答案　D　[细节理解题。根据倒数第二段several major cities可知下文提到的Chicago，St Louis和Washington都符合题目要求，故选D。]

　　E

　　Without proper planning，tourism can cause problems. For example，too many tourists can crowd public places that are also enjoyed by the inhabitants of a country. If tourists create too much traffic，the inhabitants become annoyed and unhappy. They begin to dislike tourists and to treat them impolitely. They forget how much tourism can help the country's economy. It is important to think about the people of a destination country and how tourism affects them. Tourism should help a country，keep the customs and beauty that attract tourists. Tourism should also advance the wealth and happiness of local inhabitants.

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