答案：　A

　　3．解析：　考查细节理解。由文章第六段第一句以及最后一句可知，这种系统早已经在非洲使用，所以这种系统并不是美国研究人员最先发明的。

　　答案：　D

　　4．解析：　考查细节理解。根据文章倒数第三段尤其是本段后半部分内容可知，evergreen agriculture这种方式之所以受农民们的欢迎，在于它能改良土壤，故选择A项。

　　答案：　A

　　5．解析：　考查推理判断。根据文章最后两段可知，John Reganold提到Rhoda Mang’yana是为了证明这种种植方式是有效果的。

　　答案：　C

　　答案：41-44 CCDA

　　55—58 CBAD

　　、阅读表达

　　71．to be found

　　72．There is no chance

　　73．addicted was he to

　　74．equipped with

　　75．had concentrated on

　　76．Occupied with

　　77．must have happened

　　78．What he referred to

　　79．neither of whom was eager

　　80．(that) he has been expecting

　　、书面表达

　　Dear Sir,

　　I’m writing to request a valuable chance to be one of the host families of the American students.

　　We have a large and clean house with a beautiful garden behind. The house is located in the city enter. I’m good at English and my parents are both teachers of English so I’m sure we won’t have any difficulty communicating with English speakers. My father is an excellent driver and we will be very glad to show foreign students around some nearby places of interest in our own car. Last month we received two British students and we had a great time. Besides, my mother cooks well, so the students will be able to enjoy delicious Chinese food.

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