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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.

¡¾1¡¿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

¡¾2¡¿Which of the following best describe the new cataract treatment according to the passage?

A. Convenient B. Comfortable C. Cheap D. Safe

¡¾3¡¿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

¡¾4¡¿What does the underlined word ¡°congenital¡± in the fourth paragraph mean?

A. Born B. Strange C. Serious D. Dangerous.

¡¾ÌâÄ¿¡¿ÔĶÁÌî¾ä(¹²5СÌ⣻ÿСÌâ2·Ö£¬Âú·Ö10·Ö)£¨2017¡¤½­ËÕÊ¡Æô¶«ÖÐѧ¸ßÒ»ÏÂѧÆÚµÚÈý´ÎÔ¿¼£©

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There was once a lonely girl who wanted love very much.One day while she was walking in the woods she found two birds. 1 She took care of them with love and the birds grew strong.Every morning they greeted her with a beautiful song.The girl felt great love for the birds.She wanted their singing to last forever.

2 The larger and stronger of the two birds flew out of the cage.The girl watched worriedly as it flew above her.She was so frightened that it would fly away and she would never see it.So as it flew close£¬she caught it quickly.She felt very happy. 3 Her love had killed it.

She noticed the other bird standing at the door of the cage.She could feel its great need for freedom and its need to fly into th·½·¨e clear£¬blue sky. 4 The bird flew around her once£¬twice£¬three times.The girl looked happily at the bird's enjoyment.Her heart was no longer concerned with her loss(Ëðʧ)£® 5 Suddenly the bird flew closer and landed softly on her hand.It sang the sweetest song she had ever heard.

The fastest way to lose love is to hold on too tight£»the best way to keep love is to give it wings!

A£®One day the girl left the door to the cage open.

B£®She lifted it from the cage and freed it.

C£®She took them home and put them in a small cage.

D£®The birds were so beautiful that she loved them very much.

E£®She wanted the bird to be happy.

F£®She realized her mistake.

G£®However£¬when she opened her found the bird had died.

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A garden that¡¯s just right for you

Have you ever visited a garden that seemed just right for you, where the atmosphere of the garden appeared to total more than the sum(×ܺÍ) of its parts? 1 . But it doesn¡¯t happen by accident. It starts with looking inside yourself and understanding who you are with respect to the natural world and how you approach the gardening process.

¡ñ 2

Some people may think that a garden is no more than plants, flowers, patterns and masses of color. Others are concerned about using gardening methods that require less water and fewer fertilizers(·ÊÁÏ). 3 . However, there are a number of other reasons that might explain why you want to garden. One of them comes from our earliest years.

¡ñRecall(»ØÒä)your childhood memories

Our model of what a garden should be often goes back to childhood. Grandma¡¯s rose garden and Dad¡¯s vegetable garden might be good or bad, but that¡¯s not what¡¯s important. 4 ¡ªhow being in those gardens made us feel. If you¡¯d like to build a powerful bond with your garden, start by taking some time to recall the gardens of your youth. 5 then go outside and work out a plan to translate your childhood memories into your grown-up garden. Have fun.

A. Know why you garden

B. Find a good place for your own garden

C. It¡¯s our experience of the garden that matters

D. It¡¯s delightful to see so many beautiful flowers

E. Still others may simply enjoy being outdoors andclose to plants

F. You can produce that kind of magical quality in your own garden, too

G. For each of those gardens, writer down the strongest memory you have

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