Imagine you are Alice, stepping through the looking glass. Suddenly everything is re versed. Doorknobs are on the wrong side of doors. The gearshift in your car is in the wrong place. Twenty-five million Americans wake up every day in just such an awkward situation. They are the one in ten of us who are left-handed and must face the world designed for the right-handed majority. Why we are left-or-right-handed remains one of the great unsolved mysteries of science. We know that nearly two out of three lefties are male and that left-handedness runs in families. According to one study, almost half the offspring of two left-handed parents will be lefthanded. The Scots-Irish family Kerr (from the Gaelic word for "left") produced so many left-handers that in 1470 the family built its castle’s spiral stairways with a reverse twist to favor left-handed swordsmen. On the other hand, heredity alone cannot explain leffies. At least 84 percent of them are born of two right-handed parents. And in 12 percent of genetically identical twins, one will be right-handed, the other left. Perhaps the greatest puzzle of all is not why some people are left-handed, but rather why so few are. So, scientists are trying to discover the truth of the matter, and they are beginning to gain insight into many ways left-handed differ from right-handed by considering how their brains work.According to the passage, which of the following is NOT true（） A．Almost half of the children of two left-handed parents will be left-handed B．At least 84 percent of left-handers are born of two right-handed parents C．One in ten of Americans are left-handed D．In the majority of genetically identical twins, one will be right handed, the other left
Imagine you are Alice, stepping through the looking glass. Suddenly everything is re versed. Doorknobs are on the wrong side of doors. The gearshift in your car is in the wrong place. Twenty-five million Americans wake up every day in just such an awkward situation. They are the one in ten of us who are left-handed and must face the world designed for the right-handed majority. Why we are left-or-right-handed remains one of the great unsolved mysteries of science. We know that nearly two out of three lefties are male and that left-handedness runs in families. According to one study, almost half the offspring of two left-handed parents will be lefthanded. The Scots-Irish family Kerr (from the Gaelic word for "left") produced so many left-handers that in 1470 the family built its castle’s spiral stairways with a reverse twist to favor left-handed swordsmen. On the other hand, heredity alone cannot explain leffies. At least 84 percent of them are born of two right-handed parents. And in 12 percent of genetically identical twins, one will be right-handed, the other left. Perhaps the greatest puzzle of all is not why some people are left-handed, but rather why so few are. So, scientists are trying to discover the truth of the matter, and they are beginning to gain insight into many ways left-handed differ from right-handed by considering how their brains work.According to the passage, which of the following is NOT true（） A．Almost half of the children of two left-handed parents will be left-handed B．At least 84 percent of left-handers are born of two right-handed parents C．One in ten of Americans are left-handed D．In the majority of genetically identical twins, one will be right handed, the other left
题目解答
答案
D
解析
考查要点：本题主要考查学生对文章细节的理解能力，需要根据原文信息判断选项的正确性。
解题核心：需逐一比对选项与原文内容，识别出与原文矛盾的陈述。
关键点：
- 选项D中“在大多数基因相同的双胞胎中”与原文“12%的同卵双胞胎”矛盾。
- 选项C需注意“one in ten”是否被原文直接支持。
选项分析
选项A
原文提到“almost half the offspring of two left-handed parents will be left-handed”，与选项A完全一致，因此正确。
选项B
原文明确指出“at least 84 percent of them are born of two right-handed parents”，与选项B一致，正确。
选项C
文中首段提到“one in ten of us who are left-handed”，即10%的美国人是左撇子，与选项C一致，正确。
选项D
原文说明“in 12 percent of genetically identical twins, one will be right-handed, the other left”，即仅12%的同卵双胞胎中出现左右手差异，而选项D表述为“在大多数双胞胎中”，明显矛盾，因此错误。