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法破解难题。----------------------------------------4Which of the following is most clearly similar to a cline as it is described in the second paragraph of the text? A.A vegetable market in which the various items are grouped according to place of originB.A wheat field in which different varieties of wheat are planted to yield a crop that will bring the maximum profitC.A flower stall in which the various species of flowers are arranged according to their price.D.A housing development in which the length of the front struts supporting the porch of each house increases as houses are built up the hill. 参考答案： D 这是一道词汇理解题。根据原文中的“cline”一词可迅速把本题的答案信息确定在第二段第一句。第二段第一句中的“gradual”、“geographic”、“adaptive”和“environmental differences”等词提供了本题的正确答案D。考生在阅读原文回答问题时，一定要学会识读原文中的相关重要词语。----------------------------------------5Which of the following phrases from the text best expresses the author’s conclusion about the meaning of the difference between left-eyed and right-eyed flatfish? A.“Most striking” (line 3, paragraph 1)B.“variation is adaptive” (line 2, paragraph 2)C.“mechanically disadvantageous” (line 7, paragraph 3)D.“evolutionary red herring” (line 9, paragraph 4) 参考答案： D 这是一道审题定位题。根据题干中的“the author’s conclusion”可将本题的答案信息迅速确定在尾段，确切地说就是尾段的最后一句。考生一定要清楚原文作者的结论一般会出现在全文的尾段。本题的正确答案应该是涉及到尾段的选项D。
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