题目内容
Clone Test
Read the following passage, choose the one that best fits into the passage.
As a child, I was truly afraid of the dark and of getting lost：these fears were very real and caused me some uncomfortable moments.
Maybe it was the strange 1 things looked and sounded in my familiar room at night that 2 me so much. There was never total 3 , but a streetlight or passing car lights 4 clothes hung over a chair take on the 5 of a wild animal. Out of the corner of my 6 , I saw the curtains seem to move when the was no 7 . A tiny sound in the floor would seem a hundred times louder than in the daylight. My 8 would run wild, and my heart would beat fast. I would 9 very still so that the “enemy” would not discover me.
Another of my. childhood fears was that I would get lost, 10 on the way home from school. Every morning I got on the school bus right near my home－that was no 11 After school, 12 , when all the buses were 13 up along the street, I was afraid that I'd get on the wrong one and be taken to some 14 neighborhood：On school or family trips to a park or a museum, I wouldn't 15 the leaders out of my sight.
Perhaps one of the worst fears 16 all I had as a child was that of not being liked or 17 by others. Being popular was so important to me 18 , and the fear of not being liked was a 19 one.
One of the processed of growing up is being able to 20 and overcome our fears, Understanding the things that frightened us as children helps us achieve greater success later in life.
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As if there weren’t enough of them in the world already, scientists have succeeded in cloning flies. The alike fruit flies are the first insects ever cloned, says the Canadian team that created them. The question everyone asks is why anyone would want to clone flies in the first place. She hopes that the insects , which are very easy to experiment with , will help to adjust the cloning process in other animals and even in humans, where the technique is being researched to aid production of therapeutic (治疗的) stem cells.
In cloning, the DNA-containing nucleus of an adult cell is injected into an egg whose own nucleus(细胞核) has been removed. At the moment, the majority of cloned mice, sheep and other animals die before birth. It is thought this is because the adult DNA is not properly ‘reprogrammed’.
Using flies, researchers might discover genes that are important for this reprogramming, and that have matches in other animals. That is because it is relatively easy in flies to knock out the function of a single gene and then attempt cloning with these cells, which will test whether that gene is important. If such genes are confirmed, then in theory cloned mammalian embryos(晶胚) might be grown in selected solutions that change the activity of those genes to improve the technique’s success rate. Although some groups have attempted to clone insects before, Lloyd says this is the first time it has been successful. The team used a slight difference on the standard cloning process: they transferred nuclei taken from embryos rather than fully-grown adult cells. They sucked several nuclei (pl)out of developing fly embryos, and injected them into a fertilized(已受精的) fly egg. From over 800 early attempts, they cloned five adult insects, the group reports in the journal Genetics.
【小题1】The best title of this passage probably is _______.
| A．The importance of clone |
| B．First insects are cloned |
| C．The disagreement in clone |
| D．The advantages of clone |
| A．there are fewer and fewer flies in the world |
| B．flies are easy to find and cheap to use |
| C．they can gain some experience before cloning other animals |
| D．it is safe to clone flies |
| A．the difference of other animals’ genes |
| B．the improper technique of clone |
| C．the complex of other animals |
| D．the improper rearrange of the adult gene |
| A．the clone of insects before used grown-up cells |
| B．the clone of insects were never experimented before |
| C．this time scientists cloned flies successfully and easily |
| D．based on this success, other animals will be cloned in large quantities. |