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  3. You are going to read a list of headings and a text about five possible scientific breakthroughs in the 21st century. Choose the

You are going to read a list of headings and a text about five possible scientific breakthroughs in the 21st century. Choose the

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问题     You are going to read a list of headings and a text about five possible scientific breakthroughs in the 21st century. Choose the most suitable heading from the list or each numbered paragraph. The first and last paragraphs of the text are not numbered. There is one extra heading which you do not need to use.

A. We’ll "manage" Earth.
B. We’ll have a brain road map.
C. We’ll know where we came from.
D. We’ll clone many useful creatures.
E. We’ll live longer (120 years?).
F. We’ll crack the genetic code and conquer cancer.

    It is predicted that there will be 5 scientific breakthroughs in the 21st century.
    (41)______.
    Why does the universe exist? To put it another way, why is there something instead of nothing? Since the 1920s, scientists have known the universe is expanding, which means it must have started at a definite time in the past. They even have developed theories that give a detailed picture of the evolution of the universe from the time it was a fraction of a second old to the present. Over the next couple of decades, these theories will be refined by data from extraordinary powerful new telescope. We will have a better understanding of how matter behaves at the unfathomably high temperatures and pressures of the early universe.
    (42)______.
    In 19th-century operas, when the heroine coughs in the first act, the audience knows she will die of tuberculosis in Act 3. But thanks to 20th-century antibiotics, the once-dreaded, once-incurable disease now can mean nothing more serious than taking some pills. As scientists learn more about the genetic code and the way cells work at the molecular level, many serious diseases—cancer, for on—will become less threatening. Using manufactured "therapeutic" viruses, doctors will be able to replace cancer-causing damaged DNA with healthy genes, probably administered by a pill or injection.
    (43)______.
    If the normal aging process is basically a furious, invisible contest in our cells—a contest between damage to our DNA and our ceils’ ability to repair that damage—then gist-century strides in genetic medicine may let us control and even reverse the process. But before we push scientists to do more, consider: Do we really want to live in a world where no one grows old and few children are born because the planet can hold only so many people? Where would new ideas come from? What would we do with all that extra time?
    (44)______.
    In the next millennium, we’ll stop talking about the weather but will do something about it. We’ll gradually learn how to predict the effects of human activity on the Earth, its climate and its ecosystems. And with that knowledge will come an increasing willingness to use it to manage the workings of our planet.
    (45)______.
    This is the real final frontier of the 21st century: The brain is the most complex system we know. It contains about 100 billion neurons (roughly the number of stars in the Milky Way), each connected to as many as 1,000 others. Early in the next century, we will use advanced forms of magnetic resonance imaging to produce detailed maps of the neurons in operation. We’ll be able to say with certainty which ones are working when you read a word, when you say a word, when you think about a word, and so on.
    Maybe these things will come true, maybe not. But we can firmly believe that tomorrow will be more beautiful and glorious.

选项
答案F
解析 该段第三句话提到"随着科学家们对基因密码和细胞在分子水平上的运作方式了解得更多，很多严重的疾病—比如说癌症—将变得不再那么有威胁"，随后接着提到了医生会通过药片或注射来用健康的基因替代致癌的DNA，从而可推知这一段主要是讲基因和疾病方面的内容，所以F"我们将破译基因密码并战胜癌症"符合文意。
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