题目内容
Now that the summer season is in full swing, many of us will be hosting picnics and socializing outside. Chances are that we’ll also have some unwanted guests in the form of mosquitoes.
Mosquitoes seem to have a powerful ability to locate us. Zain Syed, a mosquito biologist with the University of Notre Dame’s Eck Institute for Global Health, has gone a long way toward determining how they do it. Zain studies olfaction (嗅觉) in mosquitoes and other insects and he points out that mosquitoes have a strong sense of smell. A big part of their brains are devoted to this sense. Only female mosquitoes feed on blood meals and they use the blood to produce eggs. And female mosquitoes find their blood meals through the use of smell. An understanding of the olfactory behavior of mosquitoes that lead them to feed on humans can play an important role in developing more effective methods of mosquito and disease control.
Zain is also researching the role that plants play in mosquito behavior. He points out that despite our occasional feeling that we are surrounded by lots of hungry mosquitoes, they spend a relatively short amount of time feeding. Rather, they spend considerable time on plants taking the sugars that provide energy for those occasions when they do feed.
The Notre Dame researcher’s lab is studying what smells plants that mosquitoes are attracted to give off. Again, a deeper understanding of the role of the chemicals produced by plants and how mosquitoes select plants to obtain their energy sources can lead to better control and help get rid of them.
For many of us, better mosquito control techniques would result in greater comfort and convenience when we are outdoors. In many areas of the world, however, mosquito control if a matter of life and death. A better understanding of the role smell plays in mosquito behavior can offer important clues that may lead to new control methods.
56. In the research talked about in the passage Zain Syed studies____________.
A. the behaviors of mosquitoes and factors concerning the behaviors
B. ways to kill mosquitoes when we are picnicking or socializing outside
C. how mosquitoes select plants into which the lay their eggs
D. the difference between male and female mosquitoes in feeding habits
57. What role do plants play in mosquito behavior?
A. They control the behavior of mosquitoes.
B. They give off smells to attract mosquitoes.
C. Mosquitoes like to take in sugar from plants.
D. Mosquitoes enjoy staying long on plants.
58. Mosquitoes have a powerful ability to locate us because______.
A. they have a strong sense of direction
B. they have a strong sense of smell
C. they have a large size of brain
D. they have a preference for blood
59. Zain syed studies mosquitoes so that ______.
A. he can get on well with mosquitoes
B. he can find best ways to control mosquitoes
C. he can enjoy a good time outdoors
D. he can develop mosquitoes in his lab
ACBB
应用题作业本系列答案Bored by the Chinese courses he was majoring in, Zuo Cheng, 18, couldn't imagine having to drag himself into class day after day, week after week, for four years．
The Beijing Language and Culture University student decided that enough was enough．
【小题1】
"It may seem like I've wasted a year and have to start college all over again, but now that I've settled on a field I'll be able to concentrate．" Zuo said．
Zuo is not alone．
At the China Three．Gorges University in Yicljang in Hubei Province 53 out of 59 students in the Physics Department took transfer exams last semester． 【小题2】
" 【小题3】 Many students picked colleges before majors, only to discover their mistakes a few weeks after arrival on the campus．" said Jiang Xin, 20, who was able to switch to electrical engineering and automation from physics．He said that physics graduates had few other options besides going into teaching, 【小题4】
A new survey, of 2,500 students nationwide starting in September this year, suggests that as much as 35 percent of students are disappointed by their courses．
However, Shao Yangfang, who works at the admission office of University of International Business and Economics in Beijing, advised students to consider both short-term and long-term goals．
"After graduation do you want to find yourself in a job very specially related to your college major? Or, would you like to possess the knowledge and skills that will enable you to work in many areas?【小题5】 Above all, your choice of major should be based on your own interest, abilities and personality．" Shao said．
| A．These are the questions students need to consider． |
| B．After rounds of exams and interviews, he managed to transfer to the Department of International Accounting． |
| C．He added that a career in education just didn't suit him． |
| D．Unfortunately only 22 of them got a place on another major． |
F．When we were at high schools very few of us understood how a major relates to a career．
G．When we were at high schools, we already knew what are hot majors and what are unexpected ones．