汽车的未来:快速驾驶,保护世界

The Tesla Roadster is faster than a Lamborghini,yet it runs on rechargeable battery packs.Meet the manwho built it from scratch.     

当下最酷的发明

什么车能在4秒钟内从0突然提速至60英里,时速最高达到130英里左右,且没有油箱?答案是泰斯拉公司的Roadster 100超级电力跑车。这种极速运动跑车既不会对环境造成污染,也不会对石     

放飞梦想

100-Day Countdown It goes without saying that the last 100 days is precious to us.We have already studied in our junior high school for nearly 3 years.Something happened to us,which told us to cherish all we have and study hard for the future.It is called 100-Day Countdown.     

Creatures glowing in the dark

Some animals give off light at night. If you go to nature on holiday, look out for glow-worms on warm summer nights. They can be seen up to about 100m away.     

考考你

请你翻译,并在本期内找答案: 1.It takes the human eyes an hour to adaptcompletely to seeing in the dark. Once adapted,however, the eyes are about 100, 000 times moresensitive to light than they are in bringht sunlight.     

离地球最近的5颗星(英文)

Imagine traveling in a spaceship at a speed of 25, 000 miles an hour-that's faster than any human has ever traveled in space. It would still take you many months to reach the sun and more than 100, 000 years to reach Proxima Centauri. That's far out! Here are the stars closest to the Earth.     

两栖汽车,世界最快?

A high-speed land and water vehicle which transforms from sleek sports car to jet-propelled boat at the touch of a button made waves at its unveiling.The Aquada is designed to reach speeds of 100 miles per hour on land and over 30 mph on water, according to Gibbs Technology, which developed the new technology.     

Students＇ approaches to Project Work： Self-regulated learning in Swedish upper secondary school

Individualized schoolwork and self-regulated learning has expanded in Sweden during the last decades. Such teaching methods affect the roles of teachers and students, and the demand for student responsibility increases. Upper secondary school in Sweden includes vocational and study preparation programmes, which both give general access to higher education. Since 2000 all students entering upper secondary school have to take a course called Project Work （100 credits）. The preceding course Special Work （20 credits） was only part of the study preparation programmes. This expansion from 20 to 100 credits and from a few to all study programmes was a considerable change. The study is built on data from interviews with upper secondary school students about their approaches to Project Work, as an example of self-regulated learning practices. Qualitative analyse and classification is based on earlier developed categories, and to some extent tendencies in students＇ development over time are explored. The results throw light on the relationship between different types of projects, grades and students＇ approaches to Project Work. Special interest is given to approaches considered as problematic from an educational point of view. Socio-cultural aspects show some impact, although the students＇ difficulties turn out to be more of an educational challenge.     

Preparation of natural α-tocopherol from non-α-tocopherols

Non-α-tocopherols are hydroxymethylated and hydrogenated to produce α-tocopherol in one pot process bysimultaneously reacting with paraformaldehyde and hydrogen in the presence of catalysts of benzenesulfonic acid and 5%Pd/C in an autoclave. Effects of various operation conditions have been studied. The preferable reaction conditions are: temperature 180 ℃ to 200 ℃, pressure 5.0 MPa, acid concentration 0.5 g/100 ml ethanol, mass ratio of Pd/C to tocopherols 7.1 g/100 g, and reaction time 5.0 h. A product with α-tocopherol content of 80% was obtained by using a raw material with a total tocopherols content of 80.54%. The conversion of non-α-tocopherols is almost 100%, and the mole yield ofα-tocopherol is more than 90%.     

Preparation of natural α-tocopherol from non-α-tocopherols

Non-a-tocopherols are hydroxymethylated and hydrogenated to produce α-tocopherol in one pot process by simultaneously reacting with paraformaldehyde and hydrogen in the presence of catalysts of benzenesulfonic acid and 5% Pd/C in an autoclave. Effects of various operation conditions have been studied. The preferable reaction conditions are: temperature 180 ℃ to 200 ℃, pressure 5.0 MPa, acid concentration 0.5 g/100 ml ethanol, mass ratio of Pd/C to tocopherols 7.1 g/100 g, and reaction time 5.0 h. A product with α-tocopherol content of 80% was obtained by using a raw material with a total tocopherols content of 80.54%. The conversion of non-α-tocopherols is almost 100%, and the mole yield of a-tocopherol is more than 90%.     

Visiting a Doctor(ⅩⅩ)At the Cashier's

Dialogue A(A=patient;B=cashier)A:Here's all my paper work!How much will I have to pay all to-gether?B:I'll just work it out.All together you owe 35 yuan.A:Can you change 100 yuan?B:Oh,I'm afraid not.Can you take it to the shop outside to get somechange?When you come back,don't bother to queue,just cometo the window.     

Typhoon Rose

Typhoons in the northern part of the world have girls'names.Sometimes theyhave very pretty names.Rose is a pretty name,but there was nothing pretty aboutTyphoon Rose.It was the worst typhoon to hit Hong Kong in 1970s.It began to rain steadily early in the morning of Monday,August 16th,1971.Thesea in the harbour began to get rough and the ferry boats crossing the harbour rocked androlled from side to side as the wavez became bigger and bigger.There were queues ofpeople 100 yards long and eight people wide,waiting to buy tickets to catch the last fer-     

英语开放性作文写作指导

【作文呈现】根据下面提供的情境,写一篇短文,在班会上发言。注意:词数不少于100字。A class meeting is going to be held to elect the monitor of your class.Suppose you would like to choose     

Changes of root morphology and Pb uptake by two species of Elsholtzia under Pb toxicity

Elsholtzia argyi and Elsholtzia splendens, which are Chinese endemic Pb/Zn mined and Cu mined ecotype respectively, were investigated on the aspect of their response to Pb toxicity in the presence or absence of EDTA addition. After 8 d's Pb treatment, root length, root surface area and root volume of E. splendens decreased much more than those ofE. argyi, and reduced considerably with increase of Pb, while no marked change was noted for root average diameter. Compared to E. argyi, length of root with diameter (D)＜0.2 mm was significantly reduced for E. splendens as Pb increased. D＜0.1 mm E. splendens root had cross-sectional surface area at Pb≥10 mg/L, while for E. argyi, it was at Pb＞25 mg/L. With increase ofPb, DW ofE. splendens decreased much more than that of E. argyi. E. argyi exhibited much more tolerance to Pb toxicity than E. splendens. Treatment with 100 mg/L Pb plus 50 mmol/L EDTA significantly decreased the length and surface area of D≤0.2 mm root, increased the length and surface area of 0.2≤D≤0.8 mm root for the case ofE. argyi, while for E. splendens, length and surface area of D＜0.6 mm root reduced, as compared to 100 mg/L Pb treatment, alone. At 100 mg/L Pb, shoot Pb accumulation in E. splendens and E. argyi were 27.9 and 89.0 μg/plant DW respectively, and much more Pb was uptaken by the root and translocated to the stem ofE. argyi as compared to E. splendens. Treatment of the plant with 100 mg/L Pb plus 50 mmol/L EDTA increased leaf Pb accumulation from 16.8 to 84.9 g/plant for E. splendens and from 18.8 to 52.5 g/plant for E. argyi, while both root and stem Pb pronouncedly reduced for both Elsholtzia species. The increased translocation of Pb to the leaf ofE. splendens being than that ofE. argyi after treatment with 100 mg/L Pb plus 50 mmol/L EDTA should be further investigated.     

NMET2003英语短文改错题评析

一、NMET2003短文改错评析NMET2003短文改错题难度适中,突出了对学生语言应用能力的考查现分析如下:When I first leam to write in English,I ran into many 76.——difficulties.The main problem was in that I always thught 77.——in Chinese and tried to translate anything into English. 78.——My teacher advised me to keep my diary.I followed her 79.——advice and should put down 100 words or so each day. 80.——Soon I began to enjoy talk to myself on paper,as I was 81.——learning to express me in simple English.One day I wrote 82.——a litde story and showed to my teacher.She liked it 83.——very much and reads it to the class.All said the story was 84.——a good one.Their word were a great encouragement to me. 85.——     

全国高等教育自学考试英语写作标准预测试卷(一)(考试时间150分钟)(英文)

1.Supply the missing part(20分).Studythe following passage carefully and writea conclusion of about 100 words.Makesure that tone and vocabulary you ase inunity with the passzsge provided.Let me first say that I am pleased andprivileged to be here feel certain that you willfill that future to the brim with the     

英语Units13-15单元测试题

满分:100分时间:150分钟听力测试(20分)I.听力测试(20分)第一节交际应答(5分)1.A.I memorize words.B.I am feeling bored.C.I like English very much.2.A.OK.See you.B.Of course,you can.C.It doesn’t matter.3.A.We used to hate gym class.B.We used to walk to school.C     

Remediation of Cr（Ⅵ） in solution using vitamin C

The effectiveness of vitamin C in treating Cr(Ⅵ)-contaminated water is being evaluated. Cr(Ⅵ) is an identified pollutant of some soils and groundwater. Vitamin C, an important biological reductant in humans and animals, can be used to transform Cr(Ⅵ) to essentially nontoxic Cr(Ⅲ). The removal efficiency was 89% when the mass concentration of vitamin C was 80 mg/L in 60 min, and nearly 100% Cr(Ⅵ) was removed when the mass concentration was 100 mg/L. Our data demonstrated that the removal efficiency was affected by vitamin C concentration, the reaction temperature and the dissolved oxygen concentration.The reaction mechanism of Cr(Ⅵ) by vitamin C was presented. Our study opens the way to use vitamin C to remediate Cr(Ⅵ)-contaminated soils and groundwater.     

Science Letters:Remediation of Cr(Ⅵ) in solution using vitamin C

The effectiveness of vitamin C in treating Cr(Ⅵ)-contaminated water is being evaluated. Cr(Ⅵ) is an identified pollutant of some soils and groundwater. Vitamin C, an important biological reductant in humans and animals, can be used to transform Cr(Ⅵ) to essentially nontoxic Cr(Ⅲ). The removal efficiency was 89% when the mass concentration of vitamin C was 80 mg/L in 60 min, and nearly 100% Cr(Ⅵ) was removed when the mass concentration was 100 mg/L. Our data demonstrated that the removal efficiency was affected by vitamin C concentration, the reaction temperature and the dissolved oxygen concentration.The reaction mechanism of Cr(Ⅵ) by vitamin C was presented. Our study opens the way to use vitamin C to remediate Cr(Ⅵ)-contaminated soils and groundwater.     

狗能教人新把戏?(英文)

The adage(谚语) that you cannot teach an old dog new tricks may be the wrongway round. It could have been that new tricks were taught to people by dogs more than 100, 000 years ago,prompting(促进,激励) humankind to take a leap(跳跃,飞跃) in development leading to modern culture and society, Australia-based researchers said this week.