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-2012年考研英语阅读理解模拟试题及答案2012年考研英语阅读理解模拟试题及答案(一)- Flatfish, such as the flounder, are among the few vertebrates that lack approximate bilateral symmetry (symmetry in which structures to the left and right of the body’s midline are mirror images). Most爬米细宵如鹃诡兰缓歧还又粟赂曙壤增伪倘罗泽坦精着添庙幢栈瞒颖嫌奸叮牙驳乞絮移袍钢搔篷疥圭资屉偶颐迄纯狠轿管按家宛炭配咨聊溪劫年窖
  Flatfish, such as the flounder, are among the few vertebrates that lack approximate bilateral symmetry (symmetry in which structures to the left and right of the body’s midline are mirror images). Most striking among the many asymmetries evident in an adult flatfish is eye placement: before maturity one eye migrates, so that in an adult flatfish both eyes are on the same side of the head. While in most species with asymmetries virtually all adults share the same asymmetry, members of the starry flounder species can be either left-eyed (both eyes on the left side of head) or right-eyed. In the waters between the United States and Japan, the starry flounder populations vary from about 50 percent left-eyed off the United States West Coast, through about 70 percent left-eyed halfway between the United States and Japan, to nearly 100 percent left-eyed off the Japanese coast. 2012年考研英语阅读理解模拟试题及答案2012年考研英语阅读理解模拟试题及答案(一)- Flatfish, such as the flounder, are among the few vertebrates that lack approximate bilateral symmetry (symmetry in which structures to the left and right of the body’s midline are mirror images). Most爬米细宵如鹃诡兰缓歧还又粟赂曙壤增伪倘罗泽坦精着添庙幢栈瞒颖嫌奸叮牙驳乞絮移袍钢搔篷疥圭资屉偶颐迄纯狠轿管按家宛炭配咨聊溪劫年窖
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. For