If we planted a lot more trees in just the right places, they could reduce the amount of carbon in the atmosphere to levels not seen since the 1920s, said study leader Jean Francois Bastin, an ecologist from the Swiss Federal Institute of Technology. After examining more than 70,000 high-quality satellite photos of trees from all over the planet, ecologists concluded that the earth could support 900 million additional hectares (公顷) of tree cover.
Bastin and his colleagues developed a computer program that estimates how much forested land could be restored both now and in a future warmer world. The team members combed through 78,774 satellite photos of a variety of ecosystems- everywhere from the thick Amazon rainforest to the dry Sahel in Africa-that had been protected from human influence. They counted every tree in every photo to assess the current tree coverage in natural environments. The researchers combined that information with data about the climate, temperature and soil conditions for each ecosystem. Then they taught their program to put it all together to determine how much tree coverage a particular area could support.
The result shows trees currently cover 2.8 billion hectares of land- but they have the potential to populate as much as 4.4 billion hectares. Right now, much of the additional 1.6 billion hectares is being used for agriculture or urban spaces. The researchers took those areas off the table and saw that the earth still has 900 million hectares ready and waiting to be restored with trees an area roughly the size of Brazil. When those trees mature, they could remove 205 gigatonnes (兆吨) of carbon from the atmosphere, the study calculated, That represents about two-thirds of the roughly 300 gigatonnes of atmospheric carbon that can be traced to human actions, they said.
Even if trees are planted in the most mindful way, other actions are still needed to fight climate change, Bastin said.
1.Why did Bastin develop a computer program?
A.To reduce air pollution in Africa.
B.To determine carbon dioxide in the air.
C.To assess the potential forested land.
D.To calculate the area of forest in the world.
2.What does the underlined phrase “combed through” in Paragraph 2 refer to?
A.Looked into. B.Put away.
C.Brought back. D.Took in.
3.What can we infer from what Basin said in the last paragraph?
A.Brazil has large areas to plant trees.
B.The tree cover is not enough to control greenhouse gases.
C.Trees removed two-thirds of carbon in the atmosphere.
D.Other actions are equally important compared to planting trees.
4.What is the author’s attitude towards the research result?
A.Disapproving. B.Doubtful.
C.Supportive. D.Objective.
Festivals are about fun in large helpings(一份食物), and science festivals should be no exception There should be plenty of it at the second Edinburgh Science Festival, which runs from 2 April to 16 April, But there really does seem to be something to cater for all tastes in the impressive listing of more than 300 events.
For starters, what about a tour of tropical crops in the Botanical Gardens- tastes and smells included? You can follow that up with a course of lectures and tastings of Italian food and wine given by the finest Italian delicatessen(熟食) in the country. No trip to Scotland would be complete without a trip to a distillery(酿酒厂) to see how the" water of life" is made.
Besides food and drink "practicals", you can try something in the medicine section.There are also plenty of events designed for kids, such as the Discovery Dome and the "hands on"science tent. OK,you might say, but where is the high-tech physics, the computer science and the space technology? Well, it is all in Edinburgh, but room is unavailable here to list the entire programme: including the daily diary and A map of venues. It covers 20 pages! There is also a host of specialist conferences on a range of topics including statistics, computing and urban planning. The idea seems to be to make Edinburgh a focus of science at all levels during the festival.
The programme of the festival is well arranged and subdivided, making it easy to pick out interesting events to suit your tastes, whatever they may be. Venues and the target audience (children, adults or specialists)are all clearly coded and the maps posted along the road should make it easy to get around.
1.What do we know about the second Edinburgh Science Festival?
A.It lasts for 14 days. B.It includes 300 events.
C.It has much fun about food. D.It is the largest festival in Edinburgh.
2.What does the author strongly recommend for a trip to Scotland?
A.Tasting the delicious local food. B.Visiting the famous Botanical Gardens.
C.visiting a factory where the wine is made. D.Seeing how the drinking water is made.
3.Why can't we find information about the entire high-tech programme?
A.The information is too much to list
B.There are more important events.
C.The visitors are not interested in it.
D.The information concerned has appeared in the poster.
4.What does the last paragraph mainly tell us?
A.The events suit all the tastes.
B.It is convenient for tourists to visit the festival.
C.Tourists have to buy a map for the festival.
D.The target audience are restricted to certain events.
4 Study and Homework Apps for Android!
Brainly
Price：Free/$15 per 3 months/$24 per year
Brainly is a social network for learners. You sign up, ask questions, and get answers (usually).Additionally, you can browse the site, answer other people's questions, and help them out as well. There They charge on a quarter basis ($15)or a yearly basis($24).
Forest
Price: Free/Up to $1.99
Forest is a different type of app. One of the biggest distractions during study is your smartphone.Forest helps put a stop to that. You open the app and a tree grows, The tree dies if you leave the app.Thus, there is a little motivation to leave the thing alone while you study or do homework.
Google Play Books
Price: Free app, book costs vary
Google Play Books is an excellent source of learning material. Sometimes your textbook just isn't enough and apps like this have plenty of additional resources. Books cost money obviously. However, you only pay for them once. Books are available offline on your smartphone or tablet.
Quizlet
Price: Free/$19.99 per year
Quizlet is one of the most popular flashcard apps for language learning. You can create flashcards play memory games, and even share flashcards with classmates. It also supports 18 languages for about any subject or topic. The free version should work just fine for simple uses, though. The premium version costs $19.99 per year, which isn't expensive for a study aid.
1.What is special about Forest?
A.It helps keep you focused. B.It answers your questions.
C.It provides textbooks for your study. D.It motivates you to plant more trees.
2.Which app can you choose to learn languages?
A.Brainy. B.Forest.
C.Google Play Book. D.Quizlet.
3.What do these apps have in common?
A.They have no advertisements. B.They charge for some services.
C.They have enough learning resources. D.They are designed to do homework quickly.
假定你是李华，你的留学生朋友Tony报名参加了京剧社，请你用电子邮件通知他本周末的社团活动。内容包括：
1.表示欢迎；
2.活动地点和时间；
3.活动内容。
注意：1.词数100左右；
2.可以适当增加细节，以使行文连贯。
Dear Tony,
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Yours,
Li Hua
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处语言错误，每句中最多有两处。每处错误仅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。
I remember clearly that when I was on my eighteen birthday, my father gave me a present-a picture book. The colorfully pictures and the stories in the book make me excited. “My dear son,” he said, “to be a great man, you have to read a plenty of books.” From now on, I started to make friend with all kinds of books.
Books opened a window to the beautiful world in front of my eyes. In books, I met a variety great people. Now, I have grown up. My bookshelf is filling with books, among that is the little picture book given to me by my father. I’ll continue finding books to read. Read books is for me just like chatting with my best friend.
阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
During Major Cold (大寒), as the cold current moves southward, the weather is very cold. Although modern meteorological (气象的) observation shows that in some regions of China the weather during Major Cold is not colder than Minor Cold, the 1. (low) temperatures of the whole year still occur in the Major Cold period in some coastal 2. (area).
During Major Cold, People in Beijing have a habit of 3.(eat) “dispelling cold cake”, a kind of rice cake. Sticky rice, the cake’s main ingredient, is rich 4. sugar. It can make people feel warm all over their bodies. In Chinese the word “rice cake” has the same 5. (pronounce) with the word “higher in a new year”, 6. symbolizes good luck and continual promotion.
In Anqing of Anhui province, people 7. (traditional) eat fried spring rolls during Major Cold. They use a round, 8. (cook) and thin pancake to wrap stuffing (馅) in a thin roll. Then it is fried in a pan with oil until it turns yellow and 9. (float) to the top. The stuffing inside the spring roll contains meat or vegetables and the flavor can be salty 10. sweet.
