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 wh
题目
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.
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参考答案和解析
正确答案：
D
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。