問題詳情

        Gene therapy may be in its infancy, but great hopes for its potential to treat everything from cancer toAlzheimer’s to heart disease are forcing it to grow up fast. After two decades of lab research, gene treatments areincreasingly making their way into human clinical trials. The bulk of research so far has focused on getting a gene toits destination and coaxing it to turn on once inside a cell. On their own, genes can’t pass through cell membranes, andmuch effort has been spent to trick cells into accepting foreign genes. The most efficient couriers are so-called viralvectors: viruses whose genomes have been swapped out for therapeutic genes. Like Trojan horses, they slip genes intotarget cells undetected. But as scientists are learning, there is no safe way to hijack a virus. The vectors sometimes trigger  immune reactions. And once the genes are inside a cell, there is no way to be sure they will function asintended. Case in point: a Paris gene therapy trial to treat SCIDs, or the “bubble boy disease,” restored immunefunction in nine of 10 patients. But it was later revealed that two of them had developed leukemia.
46 What is the main idea of the passage?
(A) After two decades of lab research, gene therapy in humans has been successful in treating everything fromcancer to Alzheimer’s to heart disease.
(B) A lot of research in gene therapy has focused on getting a gene to its destination and coaxing it to turn on onceinside a cell.
(C) Although research has been done on how gene therapy can help treat serious diseases, such a treatment maycause irreversible side effects and unknown consequences.
(D) Viral vectors like Trojan horses slip genes into target cells undetected.

參考答案

答案：C
難度：適中0.504762
統計：A(9),B(28),C(53),D(6),E(0)

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