My mother is a geneticist, and from her I learned that despite our differences in size, shape and color, we humans are 99.9 percent the same. It is in our 36 to see differences: skin, hair and eye color, height, language. But also in our nature, way down in the DNA that 37 us human, we are almost the 38 . I believe there is more that unites us than 39 us. My mother came to the US from India. She is 40 enough that she got her service 41 in a diner in 1960s Dallas. My father is a white boy from Indiana whose 42 came from Germany in the mid-1800s. It seems 43 to admit now, but I never 44 that my parents were different colors. One day, I watched my parents walk 45 the street of our church together. They were 46 in the service that day, and as they walked, I saw their hands 47 together in unison(一致地). I noticed for the first time how dark my mother was, and how white my father was. I knew them as my parents 48 I realized their skin color. I'm sorry to say that now when I see a mixed-race 49 walking down the street, I see the "mixed race" first and the "couple" second. When my parents married in 1966, there were 50 places in this country that had laws 51 mixed marriage. 52 , my white grandfather, 53 father had been a typical racist, was not against their marriage. Some of us are men, some are women. Some are young, some old. Some of us are short and others 54 . Some right-handed, some left-handed. We have lots of differences; we are all 55 . But deep down inside us, down in our DNA, we are 99.9 percent the same. And I believe we need to remember that.
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小题1:C
小题2:D
小题3:A
小题4:B
小题5:C
小题6:B
小题7:A
小题8:A
小题9:A
小题10:D
小题11:D
小题12:C
小题13:C
小题14:B
小题15:D
小题16:D
小题17:B
小题18:B
小题19:C
小题20:C
题目分析：
小题1:.C。nature“本性，本质”，并且下句But also in our nature也是暗示。
小题2:D。make成为。根据本句句意“使我们成为人类”，可知答案应选D。
小题3:A。从But also in our nature来看是对上文的转折，并且文章最后一段倒数第二句也是暗示。
小题4:B。从前面的unite可以看出是divide。
小题5:.C。根据本句句意可知是因为我妈妈的皮肤太黑以致于达拉斯的餐厅拒绝为她服务。也可从“I noticed for the first time how dark my mother was”一句判断答案。
小题6:.B。turn down “拒绝”, turn out“结果是，生产”, turn over“翻阅，发动，移交”, turn back“往回走，阻挡”。
小题7:.A。从came from Germany in the mid-1800s可知应该是我父亲的祖先在十九世纪中叶从德国移民到美国。
小题8:.A。silly傻的，幼稚的，foolish 愚蠢的, 根据句意是当时我从来没有注意到我父母不同的肤色，这很傻，很幼稚。所以答案选A。
小题9:.A。notice注意到。watch和observe的意思是观察，不合句意。
小题10:.D。walk down the street是惯用法，意思为“沿街散步”。
小题11:.D。participate in参加。enter为及物动词，后面不加介词。
小题12:.C。根据句意我看到他们手拉手一起摇摆，所以选C。
小题13:C。before在……之前。
小题14:.B。夫妇，常用couple。根据句意“当我看到一对不同肤色的夫妇逛街的时候”可知答案。
小题15:D。still仍然有。这个国家当时仍然在有的地方禁止不同肤色的人通婚。
小题16:.D。ban表示法律禁止，从下句也可看出
小题17:.B。however表转折。从was not against可知与上文是转折关系
小题18:B。定语从句，表所有。我祖父的父亲曾经是一位激进分子。
小题19:C。tall在这里与short对比。
小题20:C。根据句意：我们有许许多多的差异，我们都是独一无二的，可知答案。
点评：本文属于情感类阅读，从祖先是移民多遭受的区别对待以及相关的思考可知我们虽然有很多的差异，但是每个人都是独一无二的。整个完形填空大题，设空科学合理，考生不难从中领会大意，从而下手会比较顺利，从选项中可以看出，本大题主要还是考查了词汇的辨析与运用，但更加注重综合语言能力的运用，需要根据故事情节，了解词汇用法的同时，结合语境，做出准确的判断。