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　　1.
　　A. By spreading mosquito killer sprays.
　　B. By developing effective vaccine.
　　C. By editing the gene of mosquitoes.
　　D. By using bacteria-carrying mosquitoes.
　　2.
　　A. Through mosquito bites.
　　B. Through blood transplant.
　　C. Through sex.
　　D. Through droplet spread.
　　二、听力文本
　　Researchers are reporting success in using bacteria-carrying mosquitoes to fight dengue fever. Tests involving the release of laboratory-grown mosquitoes led to sharp drops in dengue cases in several countries. Dengue infections appear to be dropping fast in communities in Indonesia, Vietnam, Brazil and Australia, an international research team reported. The results represent the first evidence from large field trials aiming to test the effectiveness of the bacteria-carrying insects. The kind of bacteria they carry is common in insects but harmless to people. Dengue spreads when a mosquito bites an infected person and then bites someone else. But the mosquitoes that were given the bacteria do not seem to pass on the disease. The first signs of success came in Australia. Mosquitoes produced to carry the Wolbachia bacteria were released in parts of North Queensland beginning in 2011. Over time, the insects spread through the local mosquito population. Health officials in those communities reported that the local spread of dengue had nearly disappeared. Next, researchers found success in areas of Asia and Latin America, where large dengue outbreaks are common. Millions of people in these areas have caught the painful and sometimes deadly disease. Early results also suggest large reductions in dengue and a related virus in a few neighborhoods in Brazil, near Rio de Janeiro. Studies are continuing in these and other countries. But the findings suggest it is possible to turn at least some mosquitoes from a public health threat into dengue fighters.
　　Question 1: How did researchers in this news report fight dengue fever?
　　Question 2: According to the news report, how does dengue fever spread?
　　三、重点词汇
　　1. bacterium (plural bacteria): a type of very small organism that lives in air, earth, water, plants, and animals, often one that causes disease
　　2. mosquito: a small flying insect that bites people and animals and sucks their blood 蚊
　　3. dengue: a serious tropical disease that is caused by a virus carried by mosquitoes. It causes a high fever and severe pain in the joints of the body. 登革热
　　四、背景知识
　　埃及伊蚊是登革热的重要传播媒介，然而一项国际研究显示，如果让这种蚊子感染沃尔巴克氏菌，它们会“改邪归正”，起到减少登革热发病率的作用。非营利机构“世界蚊子计划”研究人员在实验室中培育出一批感染沃尔巴克氏菌的埃及伊蚊，之后把它们释放到户外。它们与其他蚊子交配，繁衍出感染沃尔巴克氏菌的蚊子，使这种细菌在蚊子群中蔓延。美联社报道，研究人员21日在美国热带医学与卫生学会大会上报告，他们2011年在澳大利亚昆士兰州北部几个地方释放感染沃尔巴克氏菌的埃及伊蚊，那些地方的登革热如今几乎绝迹。他们2016年在印度尼西亚日惹附近一片区域释放感染沃尔巴克氏菌的埃及伊蚊，那里的登革热迄今减少76%。研究人员在越南南部城市芽庄附近一片区域和巴西里约热内卢附近几个区域开展类似实验，均发现登革热大幅减少。沃尔巴克氏菌是一种常见细菌，半数以上昆虫，从果蝇到蝴蝶，天生感染这种细菌，但是埃及伊蚊是个例外。“世界蚊子计划”研究人员卡梅·西蒙斯说，他们对付埃及伊蚊的办法不是用杀虫剂消灭它们，而是“改造”它们。
　　五、参考答案
　　Question 1: D
　　Question 2: A