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.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 |
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 |
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 |
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. |
Most likely, you aren’t the family breadwinner. But doing a small job or getting a weekly allowance (零花钱) would put some money in your pocket. For kids and grown-ups alike, money is easy to spend. If you aren’t careful, it can be going in no time.
Being responsible with your money is an important skill to learn — and the sooner you start the better. Whether you are tracking your spending or saving for something special, creating a budget can help you deal with your expenses and plan for the future. All you need are paper and a pencil — and some self-control.
First, take a look at our sample monthly budget. Then, use a separate sheet of paper to plan your own. In the first two columns (栏), list your sources (来源) of income and how much you expect to earn from them. In the third and fourth columns, list what you expect to spend your money on and the amount.
The left-hand total should be more than or equal to the right-hand total. If it is, you have an effective budget. Budgets are not complex, but sticking to them can be tough. When planning your budget, be realistic about your expenses. If you know that you drop $18 at a movie, don’t write $12 in that space simply because you wish you were spending less.
If you are eyeing a big purchase, such as a $150 skateboard, spend less and save more until you have the total amount. No matter how attractive it may be, avoid spending your savings. One day, you will thank yourself!
| Monthly Income |
Amount |
Monthly Expense |
Amount |
| Allowance |
$20.00 |
Snacks |
$20.00 |
| Money earned selling drinks |
$25.00 |
Music downloads |
$12.00 |
| Money earned babysitting |
$12.50 |
Movies |
$18.00 |
| Money earned delivering newspapers |
$30.00 |
Video rental |
$10.00 |
| Total |
$87.50 |
Total |
$66.00 |
Who is the passage written for?
| A．Children. | B．Parents. |
| C．Breadwinners. | D．Bank managers. |
The purpose of making a budget is to help people _________.
| A．learn to be realistic | B．increase their saving |
| C．manage their money well | D．test their power-control |
What should people do when planning a budget?
| A．Fill in the expenses as they really are. |
| B．Avoid spending money on expensive things. |
| C．Set aside a fixed amount of money as savings. |
| D．List income and expenses on two pieces of paper. |
Which of the following budgets is effective?
The passage mainly tells us _______.
| A．the importance of making a budget |
| B．how to make a budget |
| C．how to form good habits |
| D．how to spend money |
Food sometimes gets poisoned with harmful things. A person who eats such food can get an illness called food poisoning. Food poisoning is usually not serious, but some types are deadly. The symptoms of food poisoning usually begin within hours of eating the poisoned food. Fever is one of the most common symptoms.
Certain microorganisms（微生物）cause most types of food poisoning. Bacteria and other microorganisms can poison eggs, meat, vegetables, and many other foods. After enteringthe body, these tiny living things release poisons that make people sick.
Some chemicals can also cause food poisoning. They are often added to food while it is being grown, processed, or prepared. For example, many farmers spray chemicals on crops to kill weeds and insects. Some people may have a bad reaction to those chemicals when they eat the crops.
Some plants and animals contain natural poisons that are harmful to people. These include certain kinds of seafood, grains, nuts, seeds, beans, and mushrooms.
When people handle food properly, the risk of food poisoning is very small. Microorganisms multiply rapidly in dirty places and in warm temperatures. This means that people should never touch food with dirty hands or put food on unwashed surfaces. Food should be kept in a refrigerator to stop microorganisms from growing. Meat needs to be cooked thoroughly to kill any dangerous microorganisms. People should also wash food covered with chemicals before eating it. Finally, people should not eat wild mushrooms or other foods that grow in the wild. Some of these foods may contain natural materials that are poisonous to humans. In addition, some types of fish can be poisonous.
Most people recover from food poisoning after a few days of resting and drinking extra water. If people eat natural poisons, they must go to the hospital right away to have their stomachs emptied.Which of the following statements is NOT true?
| A．Food when poisoned can make people sick. |
| B．Food poisoning means death. |
| C．Food poisoning comes in varieties. |
| D．Food poisoning can be serious. |
We know from the passage that the symptoms of food poisoning _________.
| A．are always accompanied by a fever |
| B．are too common to be noted |
| C．can be noticed within hours |
| D．can be ignored |
Food poisoning can be caused by all the following EXCEPT___________.
| A．some chemicals |
| B．low temperatures |
| C．some tiny living things |
| D．certain natural materials |
From Paragraph 5, we can learn that__________.
| A．mushrooms should not be eaten |
| B．vegetables are safer than meat and seafood |
| C．natural poisons are more dangerous than chemicals |
| D．different types of food should be handled differently |
It can be inferred from the passage that_________.
| A．natural materials are safe in food processing |
| B．chemicals are needed in food processing |
| C．food poisoning can be kept under control |
| D．food poisoning is out of control |
Mr Backer is a kind-hearted man. Once he gave some food to a poor woman. Mr White, the boss of the restaurant, found it and became angry. He often gave the leftovers(剩饭菜) to some poor workers. Mr Backers lost his work for it. It was difficult for him to find work in the small country though(虽然) he was an able cook.. The war made all stop. Children couldn't go to school, most shops were closed, even some farmers were hungry. Some people were made to leave their houses and they had to find the safe places. It was an autumn night. Mr Backer hadn't any food to eat and went to bed, but he couldn't fall asleep. suddenly he heard a noise in his room. He saw a man looking for something useful there. He said nothing and watched it carefully. At last the man brought a few old clothes out of a broken paper box and took them away. He got up quickly and followed him gently(文雅地), with his quilt on his back. The man didn't find him and went into a small and wet house. Mr Backer also went in and saw there was nothing in the room. The thief(贼) saw him and was surprised. He asked, “What did you come here for?” “You have carried my things here,” said Mr Backer. “I have to move there, too!”Mr White sent Mr Backer away because .
| A．he couldn't cook |
| B．he didn't work hard |
| C．he didn't like him at all |
| D．he gave some leftovers to the poor woman |
____________ , so the people in the small country got into trouble.
| A．The war broke out(爆发) |
| B．It didn't rain |
| C．Children couldn't go to school |
| D．Shops and factories were closed |
Mr Backer couldn't go to sleep because.
| A．the weather was cold | B．the weather was hot |
| C．he was hungry | D．he was ill |
Mr Backer said nothing when the thief went into his room because.
| A．he wanted to send him to the police station |
| B．there was nothing expensive there |
| C．he was afraid the man could hurt him |
| D．he hoped the man could help him |
America is a mobile society. Friendships between Americans can be close and real, yet disappear soon if situations change. Neither side feels hurt by this. Both may exchange Christmas greetings for a year or two, perhaps a few letters for a while — then no more. If the same two people meet again by chance, even years later, they pick up the friendship. This can
be quite difficult for us Chinese to understand, because friendships between us flower
more slowly but then may become lifelong feelings, extending (延伸) sometimes deeply into both families.
Americans are ready to receive us foreigners at their homes, share their holidays, and their home life. They will enjoy welcoming us and be pleased if we accept their hospitality (好客) easily.
Another difficult point for us Chinese to understand Americans is that although they include us warmly in their personal everyday lives, they don’t show their politeness to us if it requires a great deal of time. This is usually the opposite of the practice in our country where we may be generous with our time. Sometimes, we, as hosts, will appear at airports even in the middle of the night to meet a friend. We may take days off to act as guides to our foreign friends. The Americans, however, express their welcome usually at homes, but truly can not manage the time to do a great deal with a visitor outside their daily routine. They will probably expect us to get ourselves from the airport to our own hotel by bus. And they expect that we will phone them from there. Once we arrive at their homes, the welcome will be full, warm and real. We will find ourselves treated hospitably.
For the Americans, it is often considered more friendly to invite a friend to their homes than to go to restaurants, except for purely business matters. So accept their hospitality at home!The writer of this passage must be ______.
| A．an American | B．a Chinese |
| C．a professor | D．a student |
From the last two paragraphs we can learn that when we arrive in America to visit an American friend, we will probably be ______.
| A．warmly welcomed at the airport |
| B．offered a ride to his home |
| C．treated hospitably at his home |
| D．treated to dinner in a restaurant |
The underlined words “generous with our time” in Paragraph 3 probably mean ______.
| A．strict with time | B．serious with time |
| C．careful with time | D．willing to spend time |
A suitable title for this passage would probably be “______”.
| A．Friendships between Chinese |
| B．Friendships between Americans |
| C．Americans’ hospitality |
| D．Americans’ and Chinese’s views of friendships |
◇Share Flats Happy Valley big flat, 1 room ready for use immediately. Quiet and convenient, fully furnished, park view. $6, 800 including bills with maid. Female nonsmoker. No pet. Sara 25720836 or 10077809.
◇Moving Sale 2 armchairs, red/brown at $400 each; coffee table, black, wood, $800; oil painting, big, $900; Tianjin carpet, green 3×7, $600; double bed, $500; mirror, big, square, $500; fridge, big, double-door, $1000; old pictures, $140, up, each; plants, big and small. Tel: Weekend, 2521-6011/Weekday, 2524-5867.
◇Part-time Laboratory Assistant Wanted Required by busy electronics(电子) company to help with development of computer. Should have an electronics degree and some practical experience of working in an electronics laboratory. Hours 9:30 a.m.-1:00 p.m. Mon.-Fri. Fourteen days paid leave. Salary ￥6598-10230 dependent on experience. Letter of application to: Mrs. G Chan, NOVA ELECTRONICS, 45 Gordon Rd, Hung Hom Kowloon.The one who put on the first ad probably wants to _______.
| A．rent(租) a beautiful flat of her own in Happy Valley |
| B．find another lady to share the cost to rent a flat |
| C．share her room in a flat with whoever has no pet |
| D．take on a maid to look after herself and the flat |
according to the ads, you may _______.
| A．buy an old picture for $150 |
| B．call at 25720836 and see a beautiful park |
| C．buy two armchairs for $ 400 |
| D．hire a maid by paying $6 800 |
If you want to buy some old furniture, you should_______.
| A．get in touch with NOVA ELECTRONICS |
| B．call at 2524-5867 any day except Monday |
| C．do it before you move to another place |
| D．call at either 2524-5867 on Monday or 2521-6011 on Saturday |
Once you can get a part-time job in NOVA ELECTRONICS, _______.
| A．you have to work at least 4 hours a day |
| B．you should write a letter to Mrs. G Chan |
| C．you will be given 14 days off each year besides weekends |
| D．you will get no more than $6 598 each month |