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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B
解析 这一段开头先介绍了我们所知道的最复杂的系统—大脑的组成，接着第三句提到"在下世纪初期，我们将使用先进形式的磁共振图像来谱写出运作中的神经细胞的详细地图"，由此可知，该段主要探讨的是我们的大脑，所以B"我们将有一张大脑路线图"符合文意。
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