Eat less and exercise more--it has long been a magic word for reducing those extra weight. But now it seems that all the hard work may have been in vain. Scientists say there are ten other reasons why people just keep getting bigger. They say that sleeping habits, central heating, medicines and even some pollutants   can play a role in weight gain. Traditionally, people have focused on diet and exercise to solve the problem. However the scientists from top US and Canadian universities say that other things must be considered. Lack of sleep could be partly the reason. In recent years, the average night's sleep has dropped from nine hours to just seven. Sleep shortage changes levels of the hormones   that control food intake and body fat and increase hunger and appetite. If it is too hot or too cold, we burn calories   to cool down or heat up. But if the temperature is just right, the calories may be turned into body fat instead. Those who take medicine to control their blood pressure can often put on weight. Similarly, studies have shown that going on the Pill can add to a woman's weight. Mother nature may also be the reason, with our body shape being partly inherited  . The overweight are also more likely to settle with partners of a similar size. And their children are more likely to be obese  .  And the use of pollutants is on the rise, say the researchers. The man-made chemicals in pesticides   and plastics can lead to weight gain. Your mother's age and your weight at birth are also important, with older woman more likely to have obese children and underweight babies having a bigger chance of being obese in later life. We also tend to put on weight as we get older. Finally, giving up smoking can also help pile on the pounds. The scientists from Yale, Cornell and Johns Hopkins said there was some evidence supporting poor diet and lack of exercise as the main causes of obesity. Which is commonly thought to be effective in losing weight? A) To have operation to cut extra fat. B) To take pills and avoid fatty food. C) To sleep less to burn more calories. D) To have less food and take more exercise.
D


(Question)
As an experienced photojournalist in Nashville, Tennessee, I was hired by USA Today newspaper to photograph a spinal bifida   corrective surgical procedure. It was to be performed on a twenty-one week old fetus in uterus at Vanderbilt University Medical Center. At that time, in 1999, twenty-one weeks in uterus was the earliest that the surgical team would consider for surgery. The worst possible outcome would be that the surgery would cause premature delivery, and no child born earlier than twenty-three weeks had survived. The tension could be felt in the operating room as the surgery began. A typical C-section cut was made to access the uterus, which was then lifted out and laid at the junction of the mother's thighs . The entire procedure would take place within the uterus, and no part of the child was to breach the surgical opening. During the procedure, the position of the fetus was adjusted by gently moving the outside of the uterus. The entire surgical procedure on the child was completed in one hour and thirteen minutes. When it was over, the surgical team breathed a sigh of relief, as did I. As a doctor asked me what speed of film I was using, out of the corner of my eye I saw the uterus shake, but no one's hands were near it. _ was shaking from within. Suddenly, an entire arm thrust out of the opening, then pulled back until just a little hand was showing. The doctor reached over and lifted the hand, which reacted and squeezed the doctor's finger. As if testing for strength, the doctor shook the tiny fist. Samuel held firm. I took the picture! Wow! It happened so fast that the nurse standing next to me asked, "What happened?" "The child reached out," I said. "Oh. They do that all the time," she responded. The surgical opening to the uterus was closed and the uterus was then put back into the mother and the C-section opening was closed. It was ten days before I knew if the picture was even in focus . To ensure no digital manipulation  of images before they see them, USA Today requires that film be... In 1999, people believed that it was   _  . A) possible for a fetus 21 weeks born to survive B) likely for a fetus born 21 weeks to become abnormal C) right time for a fetus born 21 weeks to receive an operation D) risky for a fetus 21 weeks in uterus to receive an operation
(Answer)
D


Question: Everyone knows that eating too much junk food is not good to our health. Yet, what is it about junk food that is so completely irresistible ? For one thing, it's everywhere. From chips in fast food restaurants to candy in supermarkets, junk food always seems available. Thankfully, science is now providing new clues to help us reduce snacking. Make friends with dainty  eaters. Studies have found that people tend to increase or reduce the amount of food they eat depending on what their companions are taking in. See happy movies... and always get the smaller bag of popcorn . According to some experts, people eat up to 29% more popcorn if they are watching a sad or serious movie, compared to when they are watching a comedy. Viewers consumed almost 200 calories more when snacking from a large bucket, as opposed to when given a medium-sized container. Eat breakfast. Nutritionists have gone back and forth about the question of how much to eat in the morning, but new studies suggest that consuming a good breakfast is a must. Surveys on long-term weight-loss show that two key factors in keeping weight down are eating breakfast and exercising. Divide your food and conquer overeating. Any kind of dividing your food into portions slows down your eating. Any kind of marker makes you aware of what you're eating and of portion size. Researchers advise reallocating snack foods into small plastic bags. It sounds simplistic, but it works. What will he or she do if he or she wants to lose weight? A) To eat nothing in the morning. B) To get up early and to go to bed late. C) To eat breakfast and exercise. D) To snack from a medium-size bucket.
Answer:
C