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.
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
2.The scientists cloned flies because________.
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
3.The failure of most cloned animals is due to _______.
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
4.It can be inferred from the last paragraph that ______.
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.
Last August, Joe and Mary Mahoney began looking at colleges for their 17-year-old daughter, Maureen. With a checklist of criteria (衡量标准)in hand, the Dallas family looked around the country visiting half a dozen schools. They sought a university that offered the teenager’s intended major, one located near a large city, and a campus where their daughter would be safe.
“The safety issue is a big one,” says Joe Mahoney, who quickly discovered he wasn’t alone in his worries. On campus tours other parents voiced similar concerns, and the same question was always asked: what about crime? But when college officials always gave the same answer -----“That’s not a problem here,”-----Mahoney began to feel uneasy.
“No crime whatever?” comments Mahoney today. “I just don’t buy it.” Nor should he: in 1999 the U.S. Department of education had reports of nearly 400,000 serious crimes on or around our campuses. “Parents need to understand that times have changed since they went to college,” says David Nichols, author of Creating a Safe Campus. “Campus crime mirrors the rest of the nation.”
But getting accurate information isn’t easy. Colleges must report crime statistics(统计数字) by law, but some hold back for fear of bad publicity（关注）, leaving the honest ones looking dangerous. “The truth may not always be serious,” warns S. Daniel Carter of Security on Campus, Inc., the nation’s leading campus safety watchdog group.
To help concerned parents, Carter promised to visit campuses and talk to experts around the country to find out major crime issues and effective solutions.
1.It is often difficult to get correct information on campus crime because some colleges ____.
A. receive too many visitors B. mirror the rest of the nation
C. hide the truth of campus crime D. have too many watchdog groups
2.The underlined word “buy” in the third paragraph means _____.
A. mind B. admit C. believe D. expect
3. We learn from the text that “the honest ones” in the fourth paragraph most probably refers to colleges _____.
A. that are protected by campus security B. that report campus crimes by law
C. that are free from campus crime D. that enjoy very good publicity
4.What is the text mainly about?
A. Exact campus crime statistics. B. Crimes on or around campuses.
C. Effective solutions to campus crime. D. Concerns about kids’ campus safety.
Years ago while lying in my hammock（吊床）and drinking JD from the bottle, I noticed my dog dragging something under the fence. Upon inspection, to my disappointment, I realized it was the next door neighbor’s 10 – year – old daughter’s rabbit. For years I had watched her come home from school and head straight out to its cage, free it and play with it in the yard. I knew that day would be no different and fearing for our dog, I had to think fast.
The rabbit was quite dirty, as if it had put up quite a struggle, so I washed it, combed it with the dog brush and blew it dry with the leaf blower. Upon finishing its grooming I jumped the fence and replaced it back in its cage hoping its death would be written off as “natural caused”.
Back to the hammock and JD. Within the hour the neighbor’s Volvo pulled in as usual and out popped the little girl, and as usual she headed straight for the cage. Only this time she stopped about six feet away and screamed: “D—A—D—D—Y!!!”.
Her father, panic stricken, stood looking at the cage. Being the good neighbor that I am, I rushed to fence and asked if there was anything I could do.
Her father less than calmly shouted, “What kind of sick individual would dig up a little girl’s rabbit and put it back in its cage?”
1.The girl was shocked because .
A．the rabbit was killed by someone
B．the rabbit was too clean
C．the dead rabbit was cleaned and put back into the cage
D．the rabbit was asleep in the cage
2.That day the girl ran to the cage .
A．because her rabbit was there
B．because she had a habit of going there to see her rabbit
C．because she wanted to see her rabbit again
D．because the rabbit was dead
3.We can infer that the rabbit .
A．was alive before the writer saw his dog dragging it
B．was already dead before the writer saw his dog dragging it
C．was in the cage playing with the dog
D．was at the fence seeking out for food before it was killed by the dog
4.According to the story, the writer .
A．was helpful to his neighbor B．did a smart thing
C．was honest D．made a mistake
I was in a department store with my mom, aunt, and my sister a few days ago. 36 , I am one of those people who do not like to go shopping with my family. However, I decided this time to 37 them.
My aunt and I were 38 for some things to buy for our family when I noticed two 39 on the side. One of them had a little girl sitting on it with her 40 nearby and the other one was 41 . So, I decided to sit down. While I was 42 my own thing there, I 43 that the family were not in front of the 44 anymore. I saw the girl 45 and look around for her family. She came back and I saw her in 46, crying.
I knew that she 47 her family and was all by herself . Now, I am sure that almost everybody has been lost in a department store or 48 big before and we all know that feeling. 49 I went up to her and asked what was 50 and in between tears she told me she was lost. I 51 her a smile card I just bought. You should have seen the 52 on her face when she read it. Then I went up to customer service center and 53 them what happened. People there promised to 54 her. After I left, the little girl’s parents went there and I could see them looking around for the person who had found their daughter and given her the 55. Little did they know it was a regular teenager who did it.
1.A. Luckily B. Usually C. Sadly D. Surprisingly
2.A. help B. encourage C. join D. support
3.A. answering B. looking C. preparing D. calling
4.A. chairs B. children C. signs D. toys
5.A. friends B. book C. family D. bags
6.A. clean B. large C. empty D. beautiful
7.A. studying B. carrying C. buying D. doing
8.A. noticed B. believed C. doubted D. understood
9.A. shop B. gift C. girl D. lady
10. A. get up B. come up C. give up D. make up
11. A. return B. detail C. vain D. tears
12.A. hated B. raised C. lost D. lived
13.A. somewhere B. something C. everywhere D. everything
14.A. If B. As C. So D. Or
15.A. important B. wrong C. strange D. different
16.A. lent B. gave C. sent D. posted
17.A. smile B. hope C. puzzle D. worry
18.A. reminded B. warned C. asked D. told
19.A. look out for B. take care of C. wait for D. call up
20.A. courage B. money C. explanation D. card
By the time he realizes he__ into a trap, it’ll be too late for him to do anything about it.
A. walks B. walked C. has walked D. had walked
------Can those_____ at the back of the classroom hear me?
------- No problem.
A. seat B. sitted C. seated D. sat
