Mosquitoes have an extraordinary ability to target humans far away and fly straight to their unprotected skin. Regrettably, mosquitoes can do more than cause an itchy( 发痒的)wound. Some mosquitoes spread several serious diseases, including Dengue, yellow fever and malaria.
Over one million people worldwide die from these diseases each year. New research now shows how mosquitoes choose who to bite.
Mosquitoes need blood to survive. They are attracted to human skin and breath. They smell the carbon dioxide gas, which all mammals breathe out. This gas is the main way for mosquitoes to know that a warm-blooded creature is nearby.
But mosquitoes also use their eyes and sense of touch. Michael Dickinson is a professor at the California Institute of Technology. His research shows how these small insects, with even smaller brains, use three senses to find a blood meal.
Michael Dickinson's team used plumes( 烟 )- a material that rises into the air of carbon dioxide gas into a wind tunnel. They then used cameras to record the mosquitoes. The insects followed the plume.
Then, the scientists placed dark objects on the lighter colored floor and walls of the tunnel. Mr Dickinson said, at first, the mosquitoes showed no interest in the objects at all. "What was quite striking and quite surprising is that the mosquitoes fly back and forth for hours. These are hungry females and they completely ignore the objects on the floor and wall of the tunnel, But the moment they get a hit of CO2, they change their behavior quite obviously and now would become attracted to these little visual spots.
This suggested to the researchers that a mosquito's sense of smell is more important in the search for food. Once mosquitoes catch a smell of a human or animal, they also follow visual signals.
1.What do mosquitoes mainly use to find their targets?
A.Sense of smell. B.Sense of touch.
C.Sense of sight. D.Smart brains
2.How did the mosquitoes respond to the objects firstly in the experiment?
A.They flew to the dark ones B.They caught and stuck to them.
C.They took no notice of them. D.They attached themselves to them
3.How can we avoid being attacked by mosquitoes according to the text?
A.Don't let them see us
B.Use dark objects to stop them
C.Make them fly back and forth for hours
D.Attract them to objects full of carbon dioxide gas
4.What can be the best title for the text?
A.How Do Mosquitoes Survive?
B.How Do Mosquitoes Choose to Bite You?
C.Why Do Mosquitoes Need Blood?
D.Why Do Mosquitoes Attack the Human Being?
Teens love to socialize, and these websites give them a chance to do that while playing games, exploring virtual(虚拟的) worlds and taking quizzes(测试). Of course, teens also need to be safe online and report any cyber bullies(网络欺凌)
Instagram allows teens to upload photos of their daily life and share them friends. They say that a picture is worth a thousand words, and that must be true because Instagram has around 300 million users who are active each month. The platform is all about photos with short captions( 说明文字). When it comes to Instagram's users, 53 percent of them are aged 18-29, but most may be even younger and simply list their age as 18 in order to use the platform.
Habbo Hotel
Habbo Hotel is a place for teens to chat. Each teen receives a personal room to decorate with virtual objects. They can also dress their avatar(网络头像) in virtual clothes or create games to play with friends. The room might have music, be set up like a classroom, or have other features so different avatars can visit one another. Each room teens can interact in has an adult moderator (tt H m) to make sure it stays safe.
Fanlala
Fanlala is a social network that gives teens who love celebrities, music and TV shows a place to interact. Through it, a user can get the latest news and gossip on their favorite shows, as well as take quizzes to test their knowledge. Teens can set up their own profile(t*)on Fanlala and interact with other users.
Teen Chat
Teen Chat is a place for teens to interact with one another through forums(论坛)according to their interests. For example, there are chat rooms for those who love anime(4082)and for those who’ve just started college. There are also chat rooms for things like music, games, and sports. The platform offers a"Friend Finder"tool that will help teens search for people who live locally to them.
1.What makes Instagram different from other sites listed in the text?
A.It's a great place for people to share photos
B.The majority of its users are in their 20s
C.It has the largest number of users
D.Only those above 18 normally use it.
2.Which site allows its users to create their own character and design a virtual room for it?
A.Instagram B.Habbo Hotel.
C.Fanlala. D.Teen Chat.
3.What can you gain from Fanlala'?
A.Game skills. B.Sports knowledge.
C.Anime videos. D.entertainment news.
4.What would be the best title for the text?
A.Tips on online chatting B.Sites for socializing
C.Free chat rooms for everyone. D.How to fight cyber bullying
“Attention, everyone!” Miss Dalrymple looked at her class of ten-year-old. “Today we are going to create a special card for Father's Day, which falls on this weekend.” Then she busied herself handing out the paper and art materials to her noisy pupils.
They were a mixed punch. Some came from the rich side of the town, but the majorities were from parents who struggled to get jobs. So she had not been eager to carry out this activity.
“Think about all the things that your dad does that make him special,” she said loudly as she approached the last table. “You can write a poem or short story thinking of the positive characteristics that make your dad special. The written part of this activity should be completed before you start to decorate your card.”
Andrew looked at the blank page. He had never met, spoken to, or been hugged by his dad, so how could he write about him? Once when he was looking in his grandma's photo box, he had seen an old black and white photo but it was badly creased( 弄 皱 ) and difficult to recognize any clear features. She had quickly taken it from him and buried it deeply among the rest, never to be found again. After thinking for a while, he wrote:
Dear Dad,
You are a person I do not know and would probably not recognize as I only saw an old photo of you a long time ago. I think and wonder about you often, especially when I have no one to talk to about the Saturday fixtures( 体育 活 动 ). One day when I grow up I will do an Internet search to find you, but I am not sure whether I will be successful as several attempts by the Child Support Agency have not been successful. Happy Father's Day, Dad.
Love,
Andrew
1.What does the underlined sentence in Paragraph 2 indicate?
A.The students were not willing to finish the task.
B.The students were eager to carry out the activity.
C.The students didn't get along well with each other.
D.The students' family conditions were quite different.
2.Why did Andrew have difficulty in making a special card for his father?
A.Because his father was not a successful man.
B.Because he had never seen his father.
C.Because he forgot all the things his father did.
D.Because he and his grandma didn't like his father.
3.What can we learn from Andrew's letter?
A.Andrew's father has been dead. B.Andrew's father can't recognize him.
C.Andrew is eager to meet his father. D.Andrew is sure of finding his father.
据世界卫生组织(World Health Organization)统计，全球81%的青少年缺乏锻炼。假如你是李华，请根据以下要点用英语准备一篇发言稿，在一次国际中学生交流活动中发言。
1.缺乏运动的原因;
2.运动的好处;
3.如何制定运动计划。
注意:1.词数100字左右;
2.可以适当增加细节，以使行文连贯;
3.开头和结尾已为你写好，不计入总词数。
Dear fellow students,
According to the World Health Organization, 81% teenagers are lack of exercising.
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
That's all. Thank you!
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除:把多余的词用斜线(\) 划掉。
修改:在错的词下划一横线，并在该词下面写出修改后的词。
注意: 1.每处错误及其修改均仅限一词;
2.只允许修改10处，多者(从第11处起)不计分。
Dear Sir/Madam,
I heartedly want to be a volunteer of yours. Here is something about you. I am a student who will graduate senior high school. I always regard my class as our family or sacrifice my personally interests whenever necessary. Besides take an active part in class activities, I work responsibly to build up a good reputation for the team, I respected all the people around me and I'm always willing to give a hand to those in need. I'm strict in myself, making every effort to achieve an all-round development. In time of difficult, I always keep strong minded.
In addition, I am good at English both in speaking and in writing. I was in an American host family for 20 days in the summer camp and know how to get along well with foreigners. Looking forward to your early reply.
Sincerely yours,
Li Hua
阅读下面材料，在空白处填入适当的内容(1 个单词)或括号内单词的正确形式。
The Contemporary Museum of Calligraphy (书法) contains more than 200 art pieces including Arabic, Chinese,1.(Europe), Indian, Japanese and Slavic calligraphic works.
“One of the most interesting2.(item) in the museum is a book of calligraphic work on the 36 military tactics (战术) applied during wars in ancient China," Alexey Shaburov, founder and keeper of the museum,3.(tell) a group of reporters from China on November 24.
The giant book is exhibited in a large glass case. Shaburov took it out to show some of4.(it) content. Each tactic,5.is usually expressed in four Chinese characters, is written on one page and accompanied by a Russian translation on another page. The tactics represent the6.(wise) of Chinese people. They are not only useful on the battlefield7.also for business and personal life.
He said he became crazy about calligraphy, so he decided8.(establish) a calligraphic museum in Moscow. The museum has played9.important role in promoting calligraphy in Russia.“Calligraphy wasn't seen as an art form in Russia. But this year, some of the artworks from our museum were made a part of the non-public section of the Russian museum collection,” Shaburov said,10.(add) that this means that calligraphic works' are acknowledged as cultural heritage and will be protected in Russia.
