Sometimes, you just can’t say no to another spoonful of ice cream and maybe one more after that. Why not? You deserve it.
There’s no need to beat yourself up about it later. The truth is that you were probably bound to do that from the very first spoonful. That’s because there is a switch in your brain, and for whatever reason, it can get stuck in the “on” position.
According to a new study, this impulse (冲动) control may come down to a very specific circuit (回答) in the brain which occasionally produces melanin-concentrating hormone, or MCH—a chemical linked with our desire for food or drugs. And that circuit always says yes.
By manipulating this circuit, it is possible that we might be able to develop cures for overeating that help people stick to a diet without reducing normal appetite or making delicious foods like donuts less delicious.
For their research, the scientists treated rats to a self-serve buffet. Bur the treats were on a timed delivery system, making tasty food every 20 seconds, and only when a rat pressed a lever (杠杆). Hit that lever too early—as impatient test subjects occasionally did—and the counter would start from scratch. Lever-happy rats would have to wait another cycle before the food became available again.
A second experiment offered the rats two dining options. Push Lever A and get an immediate small reward. Pushing Lever B meants waiting for around40 seconds, but the food reward would be much bigger. Guess which lever those impatient rats were most food of? That’s right. They picked the now-now-now switch.
Their impulsiveness, however, rose sharply when scientists gave the rats MCH. These animals become more impulsive. MCH, it seemed, could talk rats into loosening its inhibitions (拘束). The result? More please.
Researchers can now see where that conversation between the brain’s reward system and its impulse control center takes place. The next step will be to map it—and potentially influence the discussion. It may eventually be possible to control a food-eating impulse.
1.Which of the following can best replace the underlined word “manipulating” in paragraph 4?
A.Strengthening. B.Controlling.
C.Classifying. D.Creating.
2.What would happen when a rat pressed a lever earlier than the fixed time?
A.A bigger food reward would appear.
B.Tasty food would be delivered much sooner.
C.Longer time would be needed for food to appear.
D.The lever would be stopped form delivering food.
3.Why did the researchers conduct the experiments?
A.To find out the effect of MCH on animals.
B.To prove rats are also greedy for more food.
C.To study how levers influence rats’ impulse.
D.To show rats and humans have similar impulse for food.
4.What is the best title for the text?
A.What Is the Effect of Your Impulse?
B.What Can You Do to Resist More Food?
C.Why Can’t You Say “No” to Your Impulse?
D.Why Do You Always Give in to One More Mouthful?
Food experts say washing could spread the germs on your turkey in the kitchen sink or nearby food. But it's been a challenge trying to convince cooks to stop rinsing （冲洗）off raw poultry. Germs that can make people sick are common in the guts of healthy poultry and are legally allowed to be on raw turkey and chicken. The assumption is that nobody eats their poultry raw, and that thorough cooking will kill the bacteria.
The do — not — wash raw poultry advice from the USDA is relatively new and perhaps hasn't caught on because it goes against the common belief that washing makes things clean, said Chapman. Benjamin Chapman, a study author and food safety expert at North Carolina State University, said the instinct to wash raw poultry goes back at least decades when people relied more on visual clues to spot problems with poultry. Meanwhile, washing hands and surfaces are also important.
But food preparation is a complicated act, and germs from poultry can be spread even if it's not washed, especially when birds are removed from packaging.
The USDA-funded study stresses that point. Researchers sprayed raw chicken with a harmless strain of E. coli （大肠杆菌）and watched volunteer cooks at test kitchens. Among those who washed their raw chicken, about a quarter ended up spreading the bacteria to their lettuce. But even some of those who did not rinse the chicken got germs on the lettuce. And there are other opportunities for germs to survive on turkeys: melting and cooking.
To ensure a bird is thoroughly cooked, they say to use a thermometer to check that the deepest and thickest parts of it have reached 165 degrees. Even after the meal is cooked, you aren't out of the danger zone. To keep turkeys and other leftovers safe, experts say they should be refrigerated after two hours.
1.People don't accept USDA's advice because____.
A.the advice is relatively new
B.cleaning seems more trustworthy
C.cooks clean the turkey before cooking it
D.heat can kill most germs and no one eats raw food
2.What can be concluded from Paragraph 4?
A.Food packages carry germs.
B.Hands and surfaces are easy to get E. coli.
C.Germs from a turkey can be spread whether it is washed or not.
D.Multiple methods should be applied to food to get rid of germs.
3.Which way may help to cook a turkey safely?
A.Rinse off the turkey before it is heated.
B.Keep the turkey away from the lettuce and refrigerator.
C.Wash hands and packages before taking out the turkey.
D.Use a thermometer to check the temperature of the turkey.
4.From which section of a magazine is the text probably taken?
A.Culture. B.Science.
C.Education. D.Medicine.
“A bird with a broken wing will never fly as high. ” I’m sure T. J, Ware was made to feel this way almost every day in school.
By high school, T, J. was the most celebrated troublemaker in his town. Teachers literally cringed when they saw his name posted on their classroom lists.
I met T. J. for the first time when all the students at school were attending ACE training. At first, he showed no interest in the discussion. But slowly, the interactive games drew him in. T. J. had some brilliant thoughts on those situations, which were welcomed by his group. By the end of the activity, the other students on the team were impressed with his concern and ideas and elected T. J. co-chairman of the team.
When T. J. showed up at school on Monday morning, a group of teachers were expressing their disagreements to the school principal about his being elected co-chairman. The principal reminded them that the purpose of the program was to uncover any positive feeling and strengthen its practice until true change can take place. The teachers left the meeting, firmly convinced that failure was unavoidable.
Two weeks later, T. J. and his friends led a group of 70 students to collect food They collected a school record: 2,854 cans of food in just two hours. The local newspaper covered the event with a full-page article the next day. That newspaper story was posted on the main bulletin board at school, where everyone could see it.
T. J. ,s picture was up there for doing something great.
T. J. started showing up at school every day and answered questions from teachers for the first time. The event he started now yields 9,000 cans of food in one day, taking care of 70 percent of the need for food for one year.
T, J. reminds us that a bird with a broken wing only needs mending. But once it has healed, it can fly higher than the rest. T. J. got a job. He became productive. He is flying quite nicely these days.
1.What do we know about T.J. before he attended the training?
A. He was talkative in class.
B. He didn't have a good fame.
C. His ideas were quite impressive.
D. He showed up at school every day.
2.Why did the team members elect T.J. co-chairman?
A. He promised them a bright future.
B. They wanted to offer him a chance.
C. They thought the job was quite easy.
D. He was considered qualified for the job.
3.What do we know about people's attitude towards T. J. 's being elected?
A. Uncaring. B. Favorable.
C. Controversial. D. Doubtful.
4.What does the author try to convey with this story?
A. No pain, no gain. B. Rome wasn’t built in a day.
C. Don't judge a book by its cover. D. Treat others as you want to be treated.
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假定你是李华，想邀请你的新西兰朋友Kevin参加你校将要举行的“劳动周”相关活动。请给他写 封邮件，内容包括：
1.活动时间；
2. 活动内容（如：校园环境美化、校内垃圾分类等）；
3. 活动意义.
参考词汇：Labour Week劳动周
注意：1.词数100左右；
2.可以适当增加细节，以使行文连贯。
______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语 言错误，每句中最多有两处，每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用（\）划掉.
修改：在错的词下画一横线，并在该词下面写出修改后的词。
注意：1.每处错谋及其修改均仅限一词；
2.只允许修改10处，多者（从第11处起）不计分。
Once I came across a middle-aged man whom was accompanying his old father to the Beijing Astronomical Museum. As the old man slowly stepped out of the car, he suddenly lost his balances. But his son immediate grasped his hand and supported him before his falling. Catch hold of his son's hand, the old man breathed a deep sigh. “When you were kid, I was holding your hand to support you. Now, you are holding my hand to support mine," he said in an unhappy voice. "How time flies!" Hearing from his dad's words, the son unconsciously tighten his dad's hand. "Nothing new, Papa!" he replied softly. "Just let nature takes its course as it is or we will live a happy life."
