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    20．老师的赞赏给了我很大的鼓舞，这对一名学生而言非常宝贵．（which）The teacher's compliment（s）gave me（filled me with）a great encouragement（inspiration），which is so precious for a student．．

    分析 The teacher's compliment（s） gave me（filled me with） a great encouragement（inspiration），which is so precious for a student．

    解答 The teacher's compliment（s） gave me（filled me with） a great encouragement（inspiration），which is so precious for a student．
    本句是对过去事实的陈述，故主句用一般过去时，后面从句用一般现在时表达对老师赞赏的评价．
    由句意"这对一名学生而言非常宝贵"可知，本句可运用一个which引导非限制性定语从句来表达．give sb（fill sb with） a great encouragement（inspiration）给人鼓舞，be precious for sb对某人是宝贵的．

    点评 适当的使用定语从句对于句子的意思表达是很有帮助的，如：
    In the presence of so many people he was little tense，which was understandable在那么多人面前他有点紧张，这是可以理解的．

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    1．Decision-making under Stress
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    2．Ever since they were first put on the market in the early 1990s，gentically mondified （GM，转基因） foods have been increasingly developed and marketed in many countries in the word，mainly on the basis of their promise to end the worldwide food crisis．But can GM technology solve world hunger problems？Even if it would，is it the best solutiorr？
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    Something else，however，has been on the rise，While GM seeds are expensive，GM companics tell farmers that they will make good profits by saving money on pesticides（杀虫剂）．On the contrary，US government data show that GM crops in the US have produced an overall increase in pesticide use compared to traditional crops．"The  promise was that you could use less chemicals and boost production．But nether is true，"said Bill Christison，President of the US National Farm Coalition．
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    As a matter of fact，scientists see better ways to feed the world．Another World Bank report concluded that GM crops have little to offer to the challenges of worldwide poverty and hunger，because better ways out are available，among which"green"farming is supposed to be the first choice．

    57．The author develops the second paragraph mainlyC．
    A．by classification                       
    B．by comparison
    C．by example                              
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    59．GM companies promise farmers that they will benefit fromB．
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