四六级

2018英语四级阅读习题:决定婴儿性别

时间:2018-03-08 来源:文都网校 浏览: 分享:

      阅读向来是四级考生的复习重点,在日常练习中大家可以多吸取一些做题经验,也可以通过做练习题多总结答题技巧,下面小编为大家带来了一些英语四级阅读练习题,希望对大家有帮助!

      Henry III didn't know much about biology. He wentthrough six wives back in the 1500s, looking for onewhocould bear him a son. Scientists now know thatit's the father's sperm, not the mother's egg, whichdetermines whether a baby is a boy or a girl. Andlast week researchers at the Genetics and IVFInstitute, a private fertility(生育能力)center inVirginia, announced a new technique that will allowparents to choose the sex of their baby-to-be, before it has even been conceived. Thescientist used a tiny laser detector to measure the DNA in millions of sperm cells as they passsingle file through a narrow tube, like cattle being herded through a corral(牲口栏). In a studypublished last week, "girl sperm," which has more DNA—the genetic material— in each cell, wascollected, while "boy sperm" was discarded. And when purified girl sperm was used toimpregnate(使受孕)a group of mothers, 15 of 17 resulting babies turned out to be girls.

      The researchers say that "sex selection" can also double a mother's chance of having a son andcan be usedto avoid genetic diseases that affect only one gender, such as hemophilia(血友病). But some experts, like New York University fertility specialist Dr. Jamie Grifo, worry thatsex selection could lead to a kind ofin uteri(子宫)discrimination, especially in cultures wheresons are considered superior to daughters. "It's valuing one gender' over another," Grifo says. "I don't think that's something we should be doing." So far, patients at the institute have beenasking for both boys and girls, in order to "balance" their families. And some ethics experts saythat's fine, as long as parents are just looking for a little gender variety. "If you have threeboys, and you want a girl," says University of Texas reproductive-law professor JohnRobertson, "that's not gender bias at all."

      1.The DNA in the sperm cells can be measured ______.

      A.in the same way how the cattle are herded

      B.when they pass through a tube one behind the other

      C.after they pass through a laser tube

      D.when they are scanned by a laser detector all at a time

      2.The gender of the baby is decided by ______.

      A.the father's DNA

      B.the mother's DNA

      C.the father's sperm

      D.the mother's egg

      3.According to this passage, the practice of "sex selection" ______.

      A.can help to prevent all genetic problems

      B.is totally unacceptable to ethics experts

      C.was already realized five hundred years ago

      D.will benefit families with certain inheritable diseases

      4.Girl sperm was preferred to boy sperm in the research most probably because____

      A.girl sperm contains more genetic material

      B.more mother want to have girl babies

      C.girl sperm is healthier and more active

      D.girl sperm is more easily purified

      5.It can be concluded from the passage that author’s toward”sex selection”is____

      A.negative

      B.positive

      C.neutral

      D.favorable

      参考答案:

      1.[B] 推理判断题。解答本题的关键在于推断single file的意思。该句把精子通过试管的情形与牛群被赶入牲口圈的情形作对比,结合single一词本身的意思,可以推断single file是“一个接一个”的意思,只有选项B能表达这个意思,由此也可否定选项D。选项A最具干扰性,原句是把精子通过试管的情形比作牛群被赶人牲口圈的情形,而选项A说的是测定精子内DNA的方法与放牧的方法相同,显然选项A只是引用了原文的某些词语,但表达的意思与原文却截然不同。

      2.[C] 事实细节题。第1段第3句which引导的非限制性定语从句修饰的是the father's sperm,而不是插入语the mother’s egg,因此选项C正确。

      3.[D] 推理判断题。第2段第1句中的genetic暗示有些疾病是遗传的,即如选项D所述。第2段第1句同时表明选项A的说法是不全面的。选项B与第2段最后两句正好相反。第1段前两句说明选项C是错误的。

      4.[A] 事实细节题。第1段倒数第2句中的由which引导的定语从句表明选项A的叙述正确。

      5.[C] 观点态度题。文章第2段中作者给出了一些反对者和赞成者的观点,但是没有加以评论,可以看出作者的态度是中立的,故选项C正确。

      以上就是小编为大家介绍的相关信息,希望对大家有帮助。想了解更多四六级备考课程备考资讯,请点击文都网校四六级资讯站查询!有问题找文都☞☞☞详情咨询入口>>>

    文都名师助力通关2018年6月四六级考试
    2018年6月大学英语四级协议班 2018年6月大学英语六级协议班

         编辑推荐

    热点聚焦 备考交流

    2018年6月英语四级基础备考指导

    2017年12月四六级考试成绩核查办法

    2018年6月四六级作文复习三大方法

    2017年12月英语四六级考试成绩查询时间

    2018年6月英语四六级记单词小技巧

    2017年12月英语四六级成绩单查询真伪

    英语六级考试是什么水平?

    英语六级准考证号怎样推算?

     

    文都网校四六级学习群1:1139836391【加群

    文都网校四六级学习群2:1053314777【加群

    文都网校四六级学习群3:821773913【加群

    文都网校四六级学习群4:887259542【加群

    热门课程
    热文排行