問題詳情

第 48 至 51 題為題組         Scientists are trying to genetically modify the world in which we live. They are even trying to wipe out diseases via genetic modification. For example, researchers have tried to engineer mosquitoes to kill malaria parasites. The malaria parasite is carried by the female Anopheles mosquito. When transmitted to a human, the parasite travels first to the liver and then on to the bloodstream, where it reproduces and destroys red blood cells. An estimated 250 million people suffer from malaria each year, and about one million die—many of them children. There are currently no effective or approved malaria vaccines.         To “kill” malaria, scientists are genetically modifying a bacterium in mosquitoes so that it releases toxic compounds. These compounds are not harmful to humans or the mosquito itself, but they do kill off the malaria parasite, making the mosquito incapable of infecting humans with malaria.         Despite this achievement, scientists are faced with the challenge of giving the modified mosquitoes a competitive advantage so that they can eventually replace the wild population. Complete blockage of the malaria parasite is very important. If some of the parasites slip through the mechanism, then the next generation will likely become resistant to it. And if that happens, the scientists are back where they started.         Another challenge for scientists is to gain public approval for this genetic modification regarding mosquitoes and malaria control. Environmental activists have raised concerns about the release of genetically engineered organisms without any clear knowledge of their long-term effect on ecosystems and human health. There is still a long way to go before genetic modification techniques are put to use in disease control. 

48. What is the main idea of this passage?
(A) Researchers have found an effective way to halt the spread of insect-borne diseases around the world.
(B) Many people are worried about the effects of genetically modified organisms on the environment.
(C) It takes time to gain public support for the application of genetic modification to disease control.
(D) Genetic engineering looks promising in reducing malaria, though there may be unknown consequences.第 7 頁 103 年指考共 7 頁 英文考科- 7 -

參考答案

答案：D
難度：困難0.395833
統計：A(7),B(10),C(9),D(19),E(0)

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