13770720924


微信扫一扫获取更多优惠
找学校 / 找专业
沃顿教育
  • 教育学
  • 西北大学
  • 江西科技师范大学
  • 华东师范大学
  • 中国传媒大学
  • 华中师范大学
  • 心理学
  • 中国人民大学
  • 浙江大学
  • 西北大学
  • 上海大学
  • 四川大学
  • 西南大学
  • 南开大学
  • 中国中医科学院
  • 中央财经大学
  • 华中师范大学
  • 南京师范大学
  • 中国科学院心理研究所
  • 行政管理
  • 西北大学
  • 南开大学
  • 对外经济贸易大学
  • 中国人民大学
  • 工商管理
  • 湖北大学
  • 北京外国语大学
  • 北京化工大学
  • 北京大学
  • 亚洲城市大学
  • 荷兰商学院
  • 中国人民大学
  • 中国科学技术大学
  • 西安电子科技大学
  • 南昌大学
  • 南京理工大学
  • 西北大学
  • 宁波大学
  • 香港公开大学
  • 中国矿业大学
  • 山东大学
  • 吉林大学
  • 东南大学
  • 西南交通大学
  • 上海海事大学
  • 武汉理工大学
  • 东华大学
  • 华东理工大学
  • 东北财经大学
  • 大连海事大学
  • 中国地质大学
  • 西南财经大学
  • 在线报名
  • 在线报名
  • 在线报名
  • 2017年同等学力申硕英语阅读考前练习题

    日期: 2018-04-19
    浏览次数: 212

     

      同等学力申硕考试中,英语阅读部分占分比例很大,考生要多加强此方面的练习。以下是为大家整理的英语阅读考前练习题,大家可作为参考练习。

     

      Directions:In the following article, some sentences have been removed. For Questions 1—5,choose the most suitable one from the list A—G to fit into each of the numbered blank.There are two extra choices, which do not fit in any of the gaps.

     

      Gene therapy could be given in advance to protect high-risk patients from the consequences of suffering a stroke or heart attack,suggests a new study. A team of researchers at Brigham and Women's Hospital in Boston,US, and Queen’s University in Ontario, Canada,have shown that animals equipped with an extra gene can survive simulated heart attacks virtually undamaged. 41_______________________________________.

     

      Strokes and heart attacks occur when blockages in the arteries supplying the brain or heart muscles cut off the supply of blood to tissues.The resulting lack of oxygen kills cells,often leaving people with permanent damage,if they survive. Cells do have ways of protecting themselves when oxygen levels are low.They switch on the genes for a number of protective proteins,including heme oxygenase-1.But the researchers found that it takes 12 hours or more for cells to produce high levels of HO-1,by which time it is too late.

     

      42____________________________________.The HO-1 protein produced by the gene is identical to the natural human protein.The difference is that the added gene has multiple copies of the switch,or promoter sequence,that turns on protein production.

     

      43_____________________________________.Experiments in the lab show that cells with the extra gene produce high levels of HO-1 within an hour of oxygen levels plummeting.Next,the team injected the virus into the heart,liver or muscle tissue of rats and then cut off the blood supply to these tissues for up to an hour.The level of protection was dramatic,says team member Victor Dzau,now at Duke University in North Carolina.More recent tests show the approach can also protect brain cells,he told New Scientist.

     

      44____________________________________________.But the trouble with this approach is that there is only a narrow window of time when these drugs can make a difference.

     

      45.__________________________________________________.

      The researchers believe the approach has broad applications.Besides people who have a high risk of having a stroke or heart attack,the therapy could also help patients with injuries,shock or bacterial infections,which can reduce the blood supply to some tissue or organs,they point out.It could also be given to patients prior to complicated operations.If necessary,more genes could be added to the virus to provide even better protection.

     

      [A]The extra gene makes no difference normally,but when oxygen levels fall,more HO-1 is produced more quickly.

     

      [B]There are already drugs that can be given to patients who suffer heart attacks or strokes to help reduce cell death.

     

      [C]The gene switches on quickly in conditions of low oxygen and saves cells from death.

     

      [D] Then the extra gene can save the high-risk patients from a stroke or heart attack.

     

      [E]If cells could be coaxed to produce more HO-1 faster,the researchers reasoned,the cells might be saved during a stroke or heart attack.So they modified an adeno-associated virus to deliver an extra HO-1 gene to cells.

     

      [F]The team now plans to test the gene therapy on larger animals such as pigs.We are convinced this strategy is going to be effective,says Dzau.

     

      [G] By the time people reach a hospital and are diagnosed,it is often too late.Giving high-risk patients gene therapy in advance,by contrast,would ensure that the protective mechanism kicks in as soon as it is needed.

     

     Copyright ©2005 - 2013 江苏沃顿教育投资有限公司
    犀牛云提供企业云服务
    地址:南京市鼓楼区广州路5号君临国际2栋1102室
    电话:+86 0755-2955 6666
    传真:+86 0755-2788 8009
    邮编:330520


    ->
    客服系统
    live chat