It is difficult for doctors to help a person with a damaged brain. Without enough blood, the brain lives for only three to five minutes. More often the doctors can’t fix the damage. Sometimes they are afraid to try something to help because it is dangerous to work on the brain. The doctors might make the person worse if he operates on the brain.
Dr. Robert White, a famous professor and doctor, thinks he knows a way to help. He thinks doctors should make the brain very cold. If it is very cold, the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.
Dr. White tried his idea on 13 monkeys. First he taught them to do different jobs, and then he operated on them. He made the monkeys' blood go through a machine. The machine cooled the blood. Then the machine sent the blood back to the monkeys' brains. When the brain’s temperature was 10°C, Dr. White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After their operations the monkeys were like they had been before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.
【小题1】The biggest difficulty in operating on the damaged brain is that .
| A．the time is too short for doctors |
| B．the patients are often too nervous |
| C．the damage is extremely hard to fix |
| D．the blood-cooling machine might break down |
| A．taking the blood out of the brain |
| B．trying the operation on monkeys first |
| C．having the blood go through a machine |
| D．lowering the brain’s temperature |
a. send the cooled blood back to the brain b. stop the blood to the brain
c. have the blood cooled down d. operate on the brain
| A．a, b, c, d | B．c, a, b, d | C．c, b, d, a | D．b, c, d, a |
He _______ foreigners in his cafe before, so he didn’t know how to serve the American family.
| A．had rarely had | B．had had rarely | C．rarely had | D．had rarely |
He _______ foreigners in his cafe before, so he didn’t know how to serve the American family.
| A．had rarely had | B．had had rarely | C．rarely had | D．had rarely |
He _______ foreigners in his cafe before, so he didn’t know how to serve the American family.
| A．had rarely had | B．had had rarely | C．rarely had | D．had rarely |
He _______ foreigners in his cafe before, so he didn’t know how to serve the American family.
| A．had rarely had | B．had had rarely | C．rarely had | D．had rarely |
He _______ foreigners in his cafe before, so he didn’t know how to serve the American family.
| A．had rarely had | B．had had rarely | C．rarely had | D．had rarely |
Have you ever imagined that you could be cloned(克隆)like Dolly，the sheep，in the not too distant future?
The news that a human embryo(胚胎)has been 36 cloned for the first time has caused mixed reactions(反应)．
The 37 was carried out by scientists from the Advanced Cell Technology Inc(ACT)，in Massachusetts，US. The group 38 the news on November 25.
This is not a cloned human being. “A 39 is alive，it walks，it breathes，”said Jamie Grifo，an expert on the study of cloning at New York University School of Medicine.
“This is a set of cells in a lab that will be used to 40 someone's life.”
Such research could lead to treatment for 41 such as heart disease，AIDS and even cancer， 42 scientists.
Despite high hopes from other scientists，the news 43 concerns immediately from religious and political leaders. Several 44 in the US do not allow human cloning. President George W．Bush also made it clear that he is 45 any type of human cloning. However，the 46 at ACT said they have no interest at present in developing an early embryo into 47 .
Animals have been cloned repeatedly since Dolly，the sheep, 48 in 1997.And there were no real technical 49 to stand in the way of scientists making a cloned human embryo.
This time the research group used traditional cloning technology with a human 50 . 51 it was given DNA from an adult cell，the egg began to 52 . 53 it was stopped from becoming a baby—at a stage in which it was 54 a ball of cells. The 55 technology has been used to clone sheep，cattle and monkeys.
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One afternoon I was sitting at my favorite table in a restaurant , waiting for the food I had ordered to arrive . Suddenly I 1 that a man sitting at a table near the window kept glancing in my direction , 2 he knew me . The man had a newspaper 3 in front of him , which he was 4 to read , but I could 5 that he was keeping an eye on me . when the waiter brought my 6 the man was clearly puzzled by the 7 way in which the waiter and I 8 each other . He seemed even more puzzled as 9 went on and it became 10 that all the waiters in the restaurant knew me . Finally he got up and went into the 11 . When he came out ， he paid his bill and 12 without another glance in my direction .
I called the owner of the restaurant and asked what the man had 13 . “Well,” he said , “that man was a detective (侦探) . He 14 you here because he thought you were the man he 15 .” “What ?” I said , showing my 16 . The owner continued , “He came into the kitchen and showed me a photo of the wanted man. I 17 say he looked very much like you ! Of course , since we know you , we told him that he had made a 18 .” “Well , it’s really 19 I came to a restaurant where I’m known ,” I said . “ 20 , I might have been in trouble .”
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“Welcome, Mary,” I said. She raised her head and looked into my eyes. The smile on my face 36 . Dear God, I thought, what 37 has entered the life of this little girl?
After settling Mary into her new desk and 38 her, I went to the headmaster. She said, “Sit down and I’ll 39 you in. Mary’s mother who loved her very much was shot and killed in her 40 one night at their house. Mary, screaming, escaped to a neighbor’s. Then the child went into 41 . She hadn’t cried or 42 her mother since.”
I returned only to discover that the children were already avoiding this “ 43 ” child. “Mary’s been hurt badly, but we can do a lot to help her,” I explained gently. Bless all children. How loving they can be 44 they understand.
In spite of our 45 , we seemed to be getting no closer to Mary and even my faith was wearing 46 . My heart ached so badly, wanting this child to come alive, to be aware of the beauty, the wonder, the fun, and even the 47 of living.
Spring approaching, children 48 to make flower baskets for room decoration. During the lunch time, a girl came hurrying to me. “Come to see Mary’s basket,” she said 49 . “You’ll never believe it!” I 50 my breath at its beauty, for it couldn’t have been the work from a child that 51 .
“Mary,” I said. “This is beautiful. How did you ever 52 ?” She looked at me with the shining eyes of any 53 little girl, saying, “My mother loved flowers.”
Thank you, God, You’ve 54 us the miracle(奇迹). I knelt and put my arms around the child. Then the tears came, slowly at first, but soon she was 55 her heart out against my shoulder. The other children had tears in their eyes, too, but theirs—like mine—were tears of joy.
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