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passed out sheets of construction paper while continuing, “The first prize is ten dollars. You just have to make sure that the words on the blackboard appear somewhere on your poster.”We studied the board critically. Some of us looked with one eye and held up certain colors against the blackboard, rocking the sheets to the right or left while we conjured upour designs. Others twisted their hair around their fingers or chewed their erasers while deep in thought. We had plans for that tendollar grand prize, each and every one of us. I’m going to spend mine on candies, one hopeful would announce, while another practiced looking serious, wise and rich.Everyone in the class made a poster. Some of us used parts of those fancy paper napkins, while others used nothing but colored construction paper. Some of us used big designs, and some of us preferred to gather our art tidily down in one corner of our poster and let the space draw the viewer’s attention to it. Some of us would wander past the good students’ desks and then return to our own projects with a growing sense of hopelessness. It was yet another grownup trick of the sort they seemed especially fond of, making all of us believe we had a fair chance, and then always—always—rewarding the same old winners.I believe I drew a sailboat, but I can’t say that with any certainty. I made it. I admired it. I determined it to be the very best of all of the posters I had seen,and then I turned it in.Minutes passed.No one came along to give me the grand prize, and then someone distracted me, and I probably never would have thought about that poster again.I was still sitting at my desk, thinking, What poster? when the teacher gave me an envelope with a tendollar bill in it and everyone in the class applauded for me.41.What was the teacher’s requirement for the poster?A.It must appear in time.B.It must be done in class.C.It must be done on a construction sheet.D.It must include the words on the blackboard.42.The underlined phrase in Paragraph 3 most probably means ________.A.formed an idea forB.made an outline forC.made some space forD.chose some colors for43.After the teacher’s words, all the students in the class________.A.looked very seriousB.thought they would be richC.began to think about their designsD.began to play games44.After seeing the good students’ designs, some students________.A.loved their own designs moreB.thought they had a fair chanceC.put their own designs in a cornerD.thought they would not win the prize45.We can infer from the passage that the author________.A.enjoyed grown up tricks very muchB.loved poster petitions very muchC.felt surprised to win the petitionD.became wise and rich after the petitionC Calories are a way of keeping track of the body39。s energy budget. A healthy balance occurs when we put in about as much energy as we lose. If we consistently put more energy into our bodies than we bum, the excess will gradually be stored as fat in our cells, and well gain weight. If we bum off more energy than we replenish, well lose weight. But how many calories do we actually need? Calorie is just the unit we use to measure the energy we take in or bum.Calories are used in three ways: about 10% enables digestion, about 20% fuels physical activity, and the biggest part, around 70%, supports the basic functions of our organs. That third usage corresponds to your basal metabolic rate (基礎(chǔ)代謝率), a number of calories you would need to survive if you weren39。t eating or moving around.According to the official guidelines, average person requires each day 2000 calories for women and 2500 for men. Those estimates are based on factors like average weight, physical activity and muscle mass. So does that mean everyone should take in around 2000 calories? Not necessarily. If you39。re doing an energy consuming activity, like cycling the Tour de France, your body could use up to 9000 calories per day Pregnancy requires slightly more calories than usual, and elderly people typically have a slower metabolic rate, energy is burned more gradually, so less is needed.And one thing you should also know. The calorie counts on nutrition labels measure how much energy the food contains, not how much energy you can actually get out of it, Fibrous (纖維的) foods like c