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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.
It can be inferred that cracking the genetic code and conquering cancer are related because
选项 A、the latter can be achieved based on the knowledge of the former.
B、the latter can prove the existence of the former.
C、the former reverses the process of the latter.
D、the former generates the therapeutic viruses for the latter.
答案A
解析 从文中可以推断出，破译遗传密码和攻克癌症是相互联系的，因为[A]攻克癌症是建立在对基因谱知识的了解之上。[B]攻克癌症能够证明基因谱的存在。[C]破译遗传密码逆转了攻克癌症的过程。[D]破译遗传密码为攻克癌症生产了“治疗性”病毒。根据题目中的关键词cracking the genetic code和conquering cancer，可在第三段找到解答此题的相关信息。本段指出：由于科学家对基因密码更加了解，科学家们可以通过使用生产出来的“治疗性”病毒，用健康的基因取代受癌症破坏的脱氧核糖核酸。由此可以推断出攻克癌症是建立在对基因谱知识的了解之上的，这是[A]项的内容。[B]错在原文并没有提到攻克癌症能够证明基因谱的存在；[C]、[D]都是出题人把这一段的一些片断抽取出来，再进行连接，其实选项的主语和宾语与谓语并无内在的联系。
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