单选题Which of the following is most clearly similar to a cline as it is described in the second paragraph of the text?AA vegetable market in which the various items are grouped according to place of origin.BA wheat field in which different varieties of wheat are planted to yield a crop that will bring the maximum profit.CA flower stall in which the various species of flowers are arranged according to their price.DA housing development in which the length of the front struts supporting the porch of each house increases as houses are built up the hill.
单选题
Which 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 origin.
B
A wheat field in which different varieties of wheat are planted to yield a crop that will bring the maximum profit.
C
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.
参考解析
解析：
词汇理解题。文章第二段第一句提到Biologists call this kind of gradual variation over a certain geographic range a “cline” and interpret clines as strong indications that the variation is adaptive, a response to environmental differences。即cline是受环境影响而产生的某种适应性变化，D项“支撑房子门廊的前方支柱随着房子在山上建造的高度增加而伸长”，与原文的“受环境影响而产生适应性变化”表述一致，本题答案是D项。
词汇理解题。文章第二段第一句提到Biologists call this kind of gradual variation over a certain geographic range a “cline” and interpret clines as strong indications that the variation is adaptive, a response to environmental differences。即cline是受环境影响而产生的某种适应性变化，D项“支撑房子门廊的前方支柱随着房子在山上建造的高度增加而伸长”，与原文的“受环境影响而产生适应性变化”表述一致，本题答案是D项。
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