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Dear Sally,
Now I'd like to tell you something about my part-time job this summer vacation, of which I worked like a guide in a travel agency.The work was interesting but tired. I think it was helpful to work this holiday. It was the first time that I have earned money on my own.I've come to understand how hard my parents work to support for the family. I used to keep on ask them for money, but now I'll never waste money and learn to share worry with my parent. I've learnt how to get along well with others.
What's worse, I've gained some working and social experience and I have learnt something can' t be learnt from textbooks. All these will be good for my future. In a word, I had the wonderful and valuable summer vacation.
Yours,
Li Bing
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Researchers in China and the United States have developed a new cataract(°×ÄÚÕÏ)treatment with cells that has restored vision in babies in a trial and may eventually be used in adults.
The treatment- by doctors and staff members at the University of California, San Diego School of Medicine and Sichuan and Sun Yat-sen universities in China-was published in March 9 edition of the scientific journal Nature.
A cataract is a clouding of the normally clear lens(¾§Ìå)of an eye. Typical cataract operation involves the removal of the cloudy lens and the insertion of an artificial one. The new operation has been tested in animals and during a small, human trial. It resulted in fewer complications(²¢·¢Ö¢)than the current harmful operation, and in regrown lenses with superior visual function in all 12 of the baby cataract patients who received the procedure.
A congenital cataract- lens clouding that occurs at birth or shortly after- is important cause of blindness in children. In the new research, Kand Zhang, head of ophthalmic genetics at US San Diego's Shiley Eye Institute, and his colleagues relied on the regrown potential of endogenous(ͬԴµÄ)stem cells.
According to Zhang, endogenous stem cells are different from other stem cells that are typically grown in a laboratory, transplanted into a patient, and can have risks of immune£¨ÃâÒߵģ©rejection, infection or cancers. Zhang told CBS News, ¡°We invented a new operation to make a very small opening at the side of a cataractous lens bag, remove the cataract inside, allow the opening to heal, and promote potential lens stem cells to regrow an entirely new lens with vision.¡±
The human trial involved 12 babies under the age of 2 who were treated with the new method, while 25 babies received thee standard operation care.. The latter group experienced a higher incidence of pos- operation danger, early- onset eye high blood pressure and increased lens clouding. The scientists reported fewer complications and faster healing among the 12 babies who has the new procedure.
£¨1£©What is the text mainly about?
A.The concept of the cataract
B.A new cataract treatment with stem cells
C.Bad effects of post-operation in the cataract
D.The reasons why the cataract comes into being
£¨2£©Which of the following best describe the new cataract treatment according to the passage?
A.Convenient
B.Comfortable
C.Cheap
D.Safe
£¨3£©What can we learn about the new cataract treatment?
A.It has more risks
B.It may be used widely
C.It has been put into practice widely
D.It can only restore vision in babies
£¨4£©What does the underlined word ¡°congenital¡± in the fourth paragraph mean?
A.Born
B.Strange
C.Serious
D.Dangerous.
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Notice
_________________________________________________________________________________
The Student Union
May 28, 2017
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¡¾ÌâÄ¿¡¿Encouraging your high school student to do their best isn't as hard as you may think.It does take time and effort, but it should become part of a daily routine that both you and your teen can enjoy more than dread.¡¾1¡¿This is excellent dinner table conversation if you can keep it light and positive.And these suggestions can help you along:
¡ôSet the expectations.
Teens need a clear map of what you want them to do.You wouldn't do your teen any favors by not telling him/her what grades you'll be expecting.Send a clear message to your teen about the grades you expect to see in each class.¡¾2¡¿Keep your expectations in line with what your teen feels he/she can do.
¡ô¡¾3¡¿
While your teen will need to keep his/her goals in line with your expectations,he/she may need your assistance. Learning to establish goals teaches independence,one of the things your teen needs to learn to become a successful adult.Have what they need at home,or a way to get it.Resources are important for high school students.Your family should have library cards and a way to access the Internet for homework.¡¾4¡¿It's also a good idea to set up a mobile homework center.
¡ôStay involved.
Show support for your teen's school by attending parents' nights and other activities or functions.Sign up for the school's online grade reports and/or have a list of teacher's email addresses.Always be respectful to your teen's teachers.¡¾5¡¿Learning in a classroom is a two-way street.Please be your teen's advocate when necessary.
A.Help him/her set goals.
B.Praise your teen for a job well done.
C.You can talk to your teen about school.
D.But don't be afraid to ask them tough questions.
E.Without these things,your teen could be at a disadvantage.
F.Set consequences for poor grades as well as rewards for good grades.
G.Tell your teen school is just the beginning and gaining knowledge should be enjoyed.
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Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership (»ï°é¹Øϵ) which is good for both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites (¼ÄÉú³æ) on sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So although they can manage without each other, they do better together.
Sometimes an animal has a plant partner. The relationship develops until the two partners cannot manage without each other. This is so in the corals(ɺº÷) of the sea. In their skins they have tiny plants which act as ¡°dustmen¡±, taking some of the waste products from the coral and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are even prevented from receiving light so that they cannot live normally, the corals will die.
£¨1£©Some birds like to sit on a sheep because _______.
A.they can eat its parasites
B.they enjoy travelling with the sheep
C.they depend on the sheep for existence
D.they find the position most comfortable
£¨2£©The underlined word ¡°they¡± in the last sentence of the first paragraph refers to ______.
A.birds and parasites
B.birds and sheep
C.parasites and sheep
D.sheep, birds and parasites
£¨3£©We learn from the text that corals depend on plants for______.
A.comfort
B.light
C.food
D.oxygen
£¨4£©What does the second paragraph mainly discuss?
A.Some animals and plants depend on each other for existence[
B.Some animals and plants develop their relationship easily.
C.Some plants depend on each other for food.
D.Some animals live better together.
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In 1905, as part of his Special Theory of Relativity, Albert Einstein published the point that a large amount of energy could be released from a small amount of matter. This was expressed by equation E = me 2(energy = mass times the speed of light squared). But bombs were not what Einstein had in mind when he published this equation.
In 1929, he publicly declared that if a war broke out he would ¡°refused to do war service, direct or indirect¡¡± His position would change in 1933, as the result of Adolf Hitler's coming into power in Germany.
Einstein's greatest role in the invention of the atomic bomb was signing a letter to President Franklin Roosevelt urging that the bomb be built because some physicists feared that Germany might be working on an atomic bomb. Among those concerned were physicists Leo Szilard and Eugene Wigner. But Szilard and Wigner had no influence with those in power. So in July 1939 they explained the problem to someone who did: Albert Einstein. After talking with Einstein, in August 1939 Szilard wrote a letter to President Roosevelt with Einstein's signature on it, which was delivered to Roosevelt in October 1939.
Germany has invaded Poland the previous month; the time was ripe for action. That October research of a-bomb began but proceeded slowly because the invention of the atomic bomb seemed distant and unlikely. In April 1940 an Einstein letter, ghost-written by Szilard, pressed the researchers on the need for ¡°greater speed¡±.
As the realization of nuclear weapons grew near, Einstein looked beyond the current war to future problems that such weapons could bring. He wrote to his friend about his fear about the future use of the a-bomb.
The atomic bombings of Japan occurred three months after Germany gave in.
In November 1954, five months before his death, Einstein summarized his feelings about his role in the creation of the atomic bomb: ¡°I made one great mistake in my life¡ when I signed a letter to President Roosevelt recommending that atom bombs be made; but there was some justification---- the danger that the Germans would make them¡±.
£¨1£©What can we learn about Szilard and Wigner?
A.They were not as influential as Einstein.
B.They were responsible for the invention of nuclear weapons
C.They had cheated their friend Albert Einstein.
D.They had an intention to destroy the world.
£¨2£©We can conclude that Einstein ___________.
A.was important in the development of atomic bomb
B.was not involved in the invention of atomic bomb
C.directly participated in the invention of the atomic bomb
D.helped with the invention of atomic bomb
£¨3£©The best title for the passage would be __________.
A.A Story of Albert Einstein
B.Albert Einstein and the Atomic Bomb
C.It was Unfair for Einstein
D.How the Atomic Bomb was Invented
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There are many ways you can show respect to others. In some cases, what you should do is listen patient when someone is speaking, even if you have anything important to say. Some other ways you can show respect includes the following ones. Take a care of borrowed things. When you borrow something but take good care of it, the person you borrowed it will surely appreciate it. Be polite, follow the rules, and practicing good manner. Clean up the mess you have made. If you don't clean up by yourself when you make a mess, someone else will have to. This can make people frustrating.
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Smart phones are so common these days. It's a wonder that our pets don't own one. But they don't necessarily have to. These four apps will help you take care of your best furry friend from dog training to first aid.
Pet First Aid
Price: $3.99
Pet First Aid helps you provide the basic care and attention that your four-legged friend might need in a medical emergency. The application shows owners how to treat illnesses with helpful videos, pictures and articles on subjects like cuts, wound treatment and more. A section called Pet Info lets you enter in information about your pets including when they had their last vaccinations, any medicines they take, or information about any diseases or conditions your animal suffers from.
Paw Card Pet Tracker
Price: Free
Paw Card helps you keep a record of your loved one's important information. Use it to record your pet's medical contacts, vaccinations, identity cards, medical conditions and medicines. Additional characteristics include a drawing showing your dog's weight over time.
Dog Park Finder
Price: Free
Dog Park Finder helps you locate dog-friendly parks and training locations in your area(USA)locations only). The app includes in formation on more than 2,200 off-leash(ÎÞÐè¸ø¹·Ë©Á´µÄ) areas, user photos and more than 6£¬500 reviews, so you can have fun with your dog off the leash.
Dog Book
Price: Free
Dog Book is a social networking application for dogs. Like Face book, users can share with other people what's going on in their dog's life, share photos, and find great animal-friendly places to meet up.
£¨1£©The app Pet First Aid is different from the other thee mainly in .
A.size
B.price
C.application
D.position
£¨2£©If you want to keep a record of your dog's weight, you can use .
A.Dog Book
B.Pet First Aid
C.Dog Park Finder
D.Paw Card Pet Tracker
£¨3£©Which one is the best choice if you want to find dog training locations?
A.Dog Park Finder
B.Pet First Aid
C.Paw Card Pet Tracker.
D.Dog Book
£¨4£©From the text we can know.
A.Dog Book users can find off-leash areas
B.Dog Park Finder provides worldwide information
C.Paw Card Pet Tracker records your dog's information
D.Pet First Aid users can find the nearest hospital easily
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