考博英语（阅读理解）模拟试卷148
阅读理解
Ariella Rosengard of the University of Pennsylvania didn\’t set out to scare anyone. She just wanted to investigate a little-understood part of the immune system by studying how viral proteins interact with it. At first, Rosengard worked with a common virus called vaccinia. But vaccinia rarely makes people sick, and she began to worry that it wouldn\’t tell her much about the human immune system. So she turned to a closely related, far more fearsome virus: smallpox.
The smallpox virus isn\’t easy to come by. Officially, it resides in only two places—secure labs in the United States and Russia. But Rosengard didn\’t need the virus itself. Scientists have made its genetic code freely available on the Internet, giving her the data she needed to synthesize a key smallpox protein in the lab. Test-tube studies showed that it works far better than the corresponding vaccinia protein at blocking a key step in the human immune response. The discovery may help explain why smallpox kills, and it could lead to new treatments.
But when Rosengard published her report last month in the Proceedings of the National Academy of Sciences of the United States of America, a slightly defensive commentary appeared with it. The article said it would be unlikely to use the work as a blueprint for making vaccinia more like smallpox. It acknowledged, however, that \\
1.Why did Ariella Rosengard decide to study smallpox?(D)
A. Because smallpox is becoming more important and complicated.
B. Because smallpox is more familiar to scientists today.
C. Because the smallpox virus can be obtained more easily.
D. Because smallpox can reveal more about the immune system.
解析：根据第1段中的这段话：But vaccinia rarely makes people sick，and she began to worry that it wouldn’t tell her much about the human immune system. So she turned to a closely related，far more fearsome virus：smallpox.可知，牛痘很少让人生病，她开始担心这种病毒不会告诉她很多关于人体免疫系统的事情。于是她转向了一种密切相关的、更为可怕的病毒：天花。由此可知，D项正确。
2.How did she obtain the smallpox protein?(A)
A. She made it from information available online.
B. She relied on secure labs for a sample.
C. She developed it by using vaccinia virus.
D. She received help from government.
解析：根据第2段中的这句话：Scientists have made its genetic code freely available on the Internet，giving her the data she needed to synthesize a key smallpox protein in the lab.可知，科学家们已经在互联网上免费提供了它的基因代码，为她提供了在实验室里合成关键天花蛋白所需的数据。由此可知，A项正确。
3.Smallpox is deadly probably because______.(B)
A. it kills vaccinia in the human immune system
B. it stops the reaction of the human immune system
C. it causes the human immune system to attack proteins
D. it reproduces quickly in the human immune system
解析：根据第2段中的这句话：Test-tube studies showed that it works far better than the corresponding vaccinia protein at blocking a key step in the human immune response. The discovery may help explain why smallpox kills，and it could lead to new treatments.可知，试管研究表明，它在阻断人类免疫反应的关键步骤方面远远优于相应的牛痘蛋白。这一发现可能有助于解释天花为什么是致命的，而由此可能产生新的治疗方法。由此可知，B项正确。
4.According to the commentary mentioned in Paragraph 3, Rosengard’s report(A)
A. would be criticized
B. would help control smallpox
C. would mislead researchers
D. would lead to more publications about smallpox
解析：根据第3段中的这段话：
本文档预览：3500字符，共14918字符，源文件无水印，下载后包含无答案版和有答案版，查看完整word版点下载
