在职申硕英语考试

{{B}}PassageFour{{/B}}Scientistsarehopin

来源:网考网在职申硕英语 所有评论

根据网考网考试中心的统计分析，以下试题在2019/5/8日在职申硕英语考试习题练习中，答错率较高，为：32%
【单选题】{{B}}Passage Four{{/B}}

Scientists are hoping to eliminate malaria (疟疾) by developing a genetically modified mosquito that cannot transmit the disease. Malaria has long troubled the populations of SouthAmerica,Africa, andAsia, where mosquito bites infect up to 500 million people a year with this serious and sometimes fatal parasitic blood disease. For generations, scientists have been trying to eliminate malaria by developing new drugs and using pesticides (杀虫剂) to wipe out local mosquito populations.But these measure aren’t working--and some scientists, like Greg Lanzaro, say that because of drug resistance and population changes, malaria is actually more prevalent now than it was 20 years ago. Lanzaro says he has a better way to stop the spread of malaria: genetically modifying mosquitoes so they are unable to carry the disease.
Lanzaro and his. colleagues are planning a multi-year project to produce malaria-resistant mosquitoes--and he thinks they can do it within five years. "We can get foreign genes into mosquitoes and they go where they’re supposed to go," Lanzaro says, pointing out that scientists have already succeeded in genetically engineering mosquitoes that cannot transmit malaria to birds and mice.And, he says, scientists are quickly making progress on genes that block transmission of the disease to humans as well.
The most difficult part scientifically, Lanzaro says, is figuring out how to get the lab-engineered mosquitoes to spread their genes into natural populations.After all, he points out, it’s useless to engineer mosquitoes in the lab that can’t transmit malaria when there are millions out in the wild that can. To solve this problem, Lanzaro wants to load up a mobile piece ofDNA、with the malaria-resistant gene, and then insert it into a group of mosquito embryos. The malaria-resistant gene would be integrated directly into the mosquitoes’DNA, making it impossible for those mosquitoes to transmit the parasite that causes malariA、In this way a small group of lab-raised mosquitoes could be released into the wild, and by interbreeding with wild mosquitoes, eventually transmit the beneficial gene to the entire population.
Lanzaro is hopeful that in a few years man can ______A．start to eliminate malaria
B．cure parasitic blood diseases
C．prevent mice from transmitting parasites
D．acquire immunity against malaria

网考网参考答案：A，答错率：32%
网考网试题解析：
第二段大意：Lanzaro和他的同事们计划在五年内生产㈩抗疟疾的蚊虫。现在他们已经成功地制造出不能向鸟类和鼠类传播疟疾的基因工程蚊虫，接下来科学家们会尽快研究出能阻止疟疾向人类传播的基因。其隐含意思是人类在几年后消除疟疾是大有希望的。其他三项为干扰项。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>

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