阅读A：
　　The sound of a mosquito can mean trouble in many parts of the world.The bite of the mosquito can be deadly.The insects carry serious diseases like malaria.It is estimated that almost 630,000 people died from malaria and malaria-related causes in 2012,and most of these cases were in African countries.
　　In the United States,a group of California scientists is working to develop a more effective and less costly substance(物质)to protect people from mosquitoes.The researchers are investigating the sense of smell in mosquitoes.They found the insects use the same receptor(感受器)for identifying carbon dioxide in human breath as they do for the smell of our skin.Anandasankar Ray,who is leading the investigation,says scientists tested more than a million chemical compounds(化合物)until they found a substance called Ethyl pyruvate.He says Ethyl pyruvate makes the mosquitoes'receptor inactive.”When we apply Ethyl pyruvate to a human arm and offer it to hungry mosquitoes in a cage,very few of the mosquitoes are attracted to the human arm because only a few of them are able to smell it out,”said Ray.
　　Genevieve Tauxe,a member of the research team,says it was not easy to find the neurons(神经元)of nose cells that recognise both the smell of human breath and skin."With the device used to examine mosquitoes,we are able to insert a very small electrode(电极)into the part of the mosquitoes'nose,where its smelling neurons are and where the smell is happening,"said Tauxe.
　　Anandasankar Ray says a product based on Ethyl pyruvate may cost less to produce than DEFT，the most effective chemical treatment now in use.He says DEFT is too costly for most people who live in areas affected by malaria.
　　“Perhaps by finding smells that can attack other target receptors,we will be able to improve upon DEFT and finally have the next generation of insect behavior control products,"said Ray.
　　1、This passage most probably appears in____.
　　A.the column of newspaper ads
　　B.the health column of a magazine
　　C.a textbook of medical schools
　　D.a collection of doctors'essays
　　参考答案：B
　　参考解析：文章类型推测题。A：报纸新闻板块B：杂志的健康板块C：医学院的教科书D：医学散文的文集。通过理解文章大意，故选B。
　　2、The best title for the passage is most probably ____.
　　A.Scientists Find New Substance to Fight Mosquitoes
　　B.A New Generation of DEET Has Been Developed to Kill Mosquitoes
　　C.Malaria一a Serious Disease Causing 630,000 Deaths
　　D.Ethyl Pyruvate一an Insect Behavior Control Product
　　参考答案：A
　　参考解析：文章标题类题。通过文章最后一段we will be able to improve upon DEFT and finally have the next generation of insect behavior control products可知DEFT只是一种杀蚊药，而文章主要讲科学家研制出一种新的效果明显花费低的药品。侧重点在于新的药品。故选A。
　　3、Through the passage,the writer aims to____.
　　A.inform readers of the new development in fighting mosquitoes
　　B.praise the achievements made in the battle against malaria
　　C.introduce a cheaper product in fighting mosquitoes
　　D.tell the differences between Ethyl Pyruvate and DEET
　　参考答案：A
　　参考解析：作者态度观点题。文章主要介绍了科学家研究一种能够影响蚊子嗅觉的药物，从而影响蚊子的叮人的行为。文章中作者只是客观介绍药物，并没有表明自己是赞扬还是批评的观点。故选A。
　　4、According to the passage,Ethyl Pyruvate can____.
　　A.kill the mosquitoes'smelling neurons
　　B.cause the mosquitoes to lose their sense of smell
　　C.result in the inactiveness of the mosquitoes'receptor
　　D.make the mosquitoes uninterested in human breath and skin smell
　　参考答案：C
　　参考解析：细节题。通过第二段He says Ethyl Pyruvate makes the mosquitoes'receptor inactive.可知Ethyl Pyruvate会使蚊子的感受器迟钝。故选C。
　　参考译文：
　　蚊子的声音在世界许多地方都意味着麻烦。蚊子的叮咬是致命的。这些昆虫携带疟疾等严重疾病。据估计，2012年，约63万人死于疟疾和疟疾相关原因，其中大多数病例发生在非洲国家。
　　在美国，加利福尼亚州的一组科学家正致力于开发一种更有效、成本更低的物质，以保护人们免受蚊子的侵害。研究人员正在研究蚊子的嗅觉。他们发现昆虫使用同样的受体识别人类呼吸中的二氧化碳，就像它们识别我们皮肤的气味一样。领导这项调查的阿南达桑卡雷说，科学家们测试了100多万种化合物，直到他们发现了一种叫做丙酮酸乙酯的物质。他说丙酮酸乙酯使蚊子的受体失去活性。雷说：“当我们把丙酮酸乙酯涂在人的手臂上，并把它放在笼子里喂饥饿的蚊子时，很少有蚊子会被人的手臂吸引，因为只有少数蚊子能闻到它的气味。”
　　研究小组的一名成员GenevieveTauxe说，要找到既能识别人呼吸气味又能识别皮肤气味的鼻细胞神经元并不容易。”Tauxe说：“使用这种用来检测蚊子的装置，我们可以在蚊子鼻子的部位插入一个非常小的电极，在那里可以检测到蚊子的嗅觉神经元，并且可以检测到蚊子的嗅觉。”
　　Anandasankar-Ray说，以丙酮酸乙酯为基础的产品生产成本可能低于目前使用的最有效的化学处理方法deft。他说，对于大多数生活在受疟疾影响地区的人来说，灵巧的技术太昂贵了。
　　雷说：“也许通过发现能够攻击其他目标受体的气味，我们就能改进灵巧的技术，最终获得下一代昆虫行为控制产品。”