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[*]W: Lily’s father gave her a key.
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What will the woman give the man?W: What would you like, tea or coffee?
M: Well, how about some juice? Some tea. Some juice. Some coffee.
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Stamps are used for ______ letters. sending writing carrying
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—Is this Tom’s dictionary?—No, it’s ______. mine my me
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It’s noisy in the room. Will you ______ the radio? turn on turn down turn up
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Having decided to buy a car, he started to ______ his money. save collect spend
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Since I began to work here three years ago, this factory ______ in size. had doubled has doubled doubled
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—I think the movie is well-made.—No, it’s the ______ I’ve ever seen. same best worst
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Willy will ______ the first party in his life tonight. He’s invited ten of his classmates. get go give
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Be quiet and ______ your work. you do to do do
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—May I speak to Peggy?—This is ______ speaking. she her she’s
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The old farmer you see here ______ in the village all his life. lives has lived lived
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You look tired. ______ don’t you have a rest? Why What How
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Do you know ______ people in the business? another others other
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______ the key this way to open the door. Take Move Turn
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Do you remember how many brothers ______. does he have he has has he
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Jack spent two hours ______ a picture. drawing to draw for drawing
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December【B1】 is Christmas Day. Christmas is an important(重要的) holiday【B2】 the United【B3】.【B4】 this day, most families get together【B5】 a big dinner. They exchange (交换) presents and visit friends. The Christmas tree is an important【B6】 of the Christmas holiday. Most families buy a tree. The family decorate (装饰) the tree【B7】.
Santa Claus(圣诞老人) has a white beard (胡子) and【B8】 a red suit (衣服). Parents always【B9】 their children that Santa Claus brings presents to all good children. He travels in a sleigh (雪橇) and comes down the chimney (烟囱). He【B10】 the presents under the Christmas tree.【B1】 twenty five 25th twenty and five
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[A] cool
[B] game
[C] aunt
[D] south
[E] east
[F] father
[G] babythe wife of one’s uncle
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Dolly the clone (克隆羊多利) was born a lamb, but her chromosomes (染色体) tell a different story. They say she was already a few years old by the time she left her mother’s womb.
Scientists at the Roslin Institute in Scotland finally took a close look at Dolly’s chromosomes and found that their ends, or telomeres(端粒——染色体端位上的着色点) , are shorter than those of normal sheep of Dolly’s age. Telomeres, scientists think, are a major factor in aging—the shorter they are, the closer the cell is to dying.
The scientists also looked at the telomere length of two other sheep, one cloned from a 9-day-old embryonic cell(受孕的胚胎细胞) and the other from a 25 day-old fetal cell. The sheep cloned from the 9-day-old cell had the longest telomeres of the three, suggesting that the key factor in determining telomere length seems to be the number of divisions the cell undergoes before being cloned.
All three clones appear to be healthy, and whether the animals will have a shorter life span as a result of their shorter telomeres remains an open question. But the shortened telomeres do suggest that genetic blueprints may wear out over time, making it impossible to clone an animal endlessly.Dolly is exactly the same as an ordinary lamb. Right Wrong Doesn’t say
