Which of the following has the least effect on the effectiveness of questions in classes?
A.students'language proficiencyB.the number of studentsC.wait-time allowed after a questionD.feedback given to students after they answer the questions

You__________be too cautious when you are driving especially on the freeway.
A.can'tB.needn'tC.mustn'tD.won't

Passage 1These days,many large city buildings are equipped with their own air-conditioning systems.These systems help keep the buildings cool,but they can also damage the environment.Since they?use a lot of electricity,for instance,they contribute indirectly to global warming.In addition,the?water that flows through the systems is often cooled using chemicals called chlorofluorocarbons,or?CFCs,that are believed to damage the Earth′s ozone layer.Recently,though,a system has been?built in the city of Toronto,Canada,that cools buildings with little damage to the environment.In the traditional air-conditioning systems found in most large buildings,water is pumped?through the building in a continuous cycle.The water is first cooled to a temperature of 4℃in?machines called chillers.It is then sent to individual units that cool the air in each room.As the?water flows through the building,it gradually becomes warmer.Finally,it reaches the roof,where it?is left to cool down naturally in a water tower.After that it is returned to the chillers,where the cycle?begins again.Toronto lies on the shore of Lake Ontario,one of North America′s Great Lakes,and the new?system makes use of cold water taken from about 80 meters below the surface of the lake.At this?depth,the water in the lake remains at 4℃all year round.This is exactly the temperature to which?the water in air-conditioning systems is cooled.However,the water from the lake is not pumped?directly into the air-conditioning systems.Instead,it is used to cool the water that is already inside?the air-conditioning systems.After that,the lake water is added to the city′s ordinary water supply.Enwave,the company that developed this deep-lake cooling system,says that it uses 75 percent?less energy than traditional air conditioning.And since no CFCs are used,no damage can be caused?to the ozone layer.Not every city is located next to a large lake,but experts believe that systems like?the one being used in Toronto could be built elsewhere by using other natural sources of cold water.What happens in the end to the water from Lake Ontario?查看材料
A.It is used by the residents of Toronto.B.It is returned to a place deep in the lake.C.It is cooled down before being used again.D.It is added to the water inside air-conditioning systems.

根据提供的信息和语言素材设计教学方案，用英文作答。设计任务：请阅读下面学生信息和语言素材．设计20分钟的英语写作教学方案。该方案没有固定格式，但须包含下列要点：·teaching objectives·teaching contents·key and difficult points·major steps and time allocation·activities and justifications教学时间：20分钟学生概况：某城镇普通中学初中二年级(八年级)学生，班级人数40人，多数学生已经达到《义务教育英语课程标准(2011年版)》三级水平。学生课堂参与积极性一般。语言素材：3a Read the three notes.Match each note with the correct situation._______Thank-you note for a girl._______Thank-you note for a party._______Thank-you note for help.Note 1Dear Kim,Sometimes it isn′t easy being the new kid at school,but I had a wonderful time on Saturday?night.Thank you so much for inviting me.I didn′t know some of the girls,but they were all really?friendly to me.And the video you showed was really funny.I feel like part of the group now.MariaNote 2Dear Ton,Thanks for showing me the school last week.I was having a hard time finding it until?you?came along.And I enjoyed meeting Carlos.He′s really good at math,isn′t he?He said he′d help?me with my math project.Friends like you make it a lot easier to get along in a new place.BillNote 3Dear Aleen,Thanks for the tickets for next week′s game.I′m sorry you and your father can′t go,but I′m?really happy to have the tickets.I′m going to ask my cousin,Tommy,to go with me.I′ll think of?you as we watch the Black Socks win the game.(I hope!)John3b Fill in the blanks in this thank-you note.Dear Sarah,________for inviting me to your house on Friday.I really________meeting your family.And?your baby sister is really________.I had a________time.I′m________.I had to leave early,but I had?a family dinner.My grandfather was having his 90th birthday party!Yours sincerely,Maria

Which of the following words doesn′t have three syllables?
A.favouriteB.countrysideC.illegibleD.consciousness

Passage 1These days,many large city buildings are equipped with their own air-conditioning systems.These systems help keep the buildings cool,but they can also damage the environment.Since they?use a lot of electricity,for instance,they contribute indirectly to global warming.In addition,the?water that flows through the systems is often cooled using chemicals called chlorofluorocarbons,or?CFCs,that are believed to damage the Earth′s ozone layer.Recently,though,a system has been?built in the city of Toronto,Canada,that cools buildings with little damage to the environment.In the traditional air-conditioning systems found in most large buildings,water is pumped?through the building in a continuous cycle.The water is first cooled to a temperature of 4℃in?machines called chillers.It is then sent to individual units that cool the air in each room.As the?water flows through the building,it gradually becomes warmer.Finally,it reaches the roof,where it?is left to cool down naturally in a water tower.After that it is returned to the chillers,where the cycle?begins again.Toronto lies on the shore of Lake Ontario,one of North America′s Great Lakes,and the new?system makes use of cold water taken from about 80 meters below the surface of the lake.At this?depth,the water in the lake remains at 4℃all year round.This is exactly the temperature to which?the water in air-conditioning systems is cooled.However,the water from the lake is not pumped?directly into the air-conditioning systems.Instead,it is used to cool the water that is already inside?the air-conditioning systems.After that,the lake water is added to the city′s ordinary water supply.Enwave,the company that developed this deep-lake cooling system,says that it uses 75 percent?less energy than traditional air conditioning.And since no CFCs are used,no damage can be caused?to the ozone layer.Not every city is located next to a large lake,but experts believe that systems like?the one being used in Toronto could be built elsewhere by using other natural sources of cold water.What is one advantage of Enwave′s new system?查看材料
A.It keeps buildings much cooler than other methods.B.It can be used by large cities anywhere in the world.C.It is much more energy-efficient than traditional systems.D.It keeps water from being used for more than one purpose.