C. the Queen’s pet dogs are fed with simple meals
D. there’s no suitable place to perform operations
27. What do we know about the tunnels in Buckingham Palace?
A. They are not well- protected.
B. They were heavily bombed.
C. They are not open to the public.
D. They are linked with other cities in Britain.
C
Mosquitoes(蚊子) ruin countless American picnics every year, but around the world, this bloodsucking beast isn’t just annoying— it causes a health problem. More than a million people die from the spread of mosquito-borne diseases like malaria and yellow fever each year. Attempts to control populations via insecticides like DDT have had ruinous side effects for nature and human health. Neurobiologist Leslie B. Vosshall has a different solution for stopping the insects and the spread of disease. “I believe the key to controlling mosquito behavior is to understand better how they sense us,” she says.
At their Rockefeller University lab, Vosshall and her colleagues are studying the chemical sensory processes by which mosquitoes choose hosts. How do they sense heat, humidity, carbon dioxide, and body odor(气味)? What makes some people more attractive to a mosquito than others? It takes blood and sweat to find out. To study how mosquitoes assess body odor, Vosshall and her teammates might wear stockings on their arms and keep from showering for 24 hours to create sample smells, Then comes the hard part. They insert their arms into the insects’ hidden home to study how mosquitoes land, bite, and feed and then they document how this changes. This can mean getting anywhere from one bite to 400, depending on the experiment. Studying male mosquitoes is more pleasant. Since they don’t feed on blood, the lab tests their sense of smell using honey.
【山东省城阳第一高级中学2015届高三上学期期中模块检测英语试卷】相关文章:
★ 河北省保定市高阳中学2015届高三上学期第十五次周练英语试卷
★ 河北省保定市高阳中学2015届高三上学期第十一次周练英语试卷
★ 浙江省杭州求是高级中学2013-2014学年高二上学期期中考试英语试卷
★ 浙江省舟山中学2014-2015学年高一上学期期中考试英语试卷
★ 吉林省长春市十一中2015届高三第二次阶段性测试 英语 Word版含答案
★ 河北省保定市高阳中学2015届高三上学期第十六次周练英语试卷
★ 浙江省温州市十校联合体2016-2017学年高一上学期期中联考英语试卷
★ 广东省广州英豪学校2014-2015学年高一上学期期中英语试卷
★ 浙江省杭州二中2014-2015学年高一上学期期中考试英语 Word版含答案
最新
2019-11-15
2019-11-15
2019-11-14
2019-11-14
2019-11-11
2019-11-11