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  3. It is predicted that there will be four scientific breakthroughs in the 21st century. We’ll know where we came from. Why doe

It is predicted that there will be four scientific breakthroughs in the 21st century. We’ll know where we came from. Why doe

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问题     It is predicted that there will be four scientific breakthroughs in the 21st century.
    We’ll know where we came from. 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’ll crack the genetic code and conquer cancer. 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 one—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.
    We’ll live longer(120 years?). If the normal aging process is basically a furious, invisible contest in our cells—a contest between damage to our DNA and our cells’ ability to repair that damage—then 21st-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?
    We’ll have a brain road map. 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, each connected to as many as 1,000 others. In the 21st 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.
The best title for the text may be
选项 A、We Can Live Longer in the 21st Century.
B、Cancer Can Be Conquered Soon.
C、The Final Frontier of the 21st Century.
D、Scientific Breakthroughs of the 21st Century.
答案D
解析 本文的最佳题目可能是[A]在21世纪我们可以活得更久。[B]癌症不久就会被攻克。[C]21世纪的“尖端领域”。[D]21世纪的科学突破。本文是一篇典型的总分类文章。第一段指出本文要介绍21世纪科学上的四大突破。后四段逐一介绍这些突破是什么，所以本文的主题就是21世纪科学上的四大突破，这正是[D]的内容。[A]、[B]、[C]三项都是文章细节，而非主题。
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