题目

厨房是家庭中重要的组成部分、以下在厨房发生的变化中，不属于化学变化的是(  ) 答案：B解析:略We live in a sweet world. The average American kid consumes more than 20 teaspoons of sugar per day, and adults eat 50% more sugar today than they did in the 1970s. We all know that too much sugar isn’t good for you. But did we know it could be dangerous? A team of researchers at the University of Utah used mice to conduct a study on the negative effects of sugar. They found it could have serious effects on people’s health.Sugar is found not only in sweets and candies, but also in many household items like pasta and crackers.During the 58-week-long study, mice were fed a diet containing 25% more sugar. This percentage equals a healthy human diet along with three cans of soda daily. The team found that these mice were twice as likely to die as mice fed a similar diet without the sugar. Though the mice did not show signs of obesity or high blood pressure, male mice were 26% less territorial and produced 25% fewer offspring than the other mice.Scientists often use mice for research because they have a similar genetic（基因） structure to humans. “Since most substances that are dangerous in mice are also dangerous in people, it’s likely that those physical problems that cause those mice to have increased deaths also work in people,” says study author James Ruff of the University of Utah. Findings from this study reveal negative effects that are not as noticeable as weight gain or heart problems. Sugar can contribute to long-term changes in the body that can change development and even shorten lives.Cutting sugar out of the American diet altogether may be difficult. But making the effort to control our nation’s sugar desire will provide for a truly sweeter future.1.The study conducted by researchers aimed at learning about________A. the advantages and disadvantages of sugarB. the negative effects of sugar on people’s healthC. the genetic structure of miceD. American’s diet2.According to the study, which of the following statements is wrong?A. Sugar can even shorten lives.B. Sugar’s negative effects are not noticeable.C. Mice are more likely to die when fed a diet containing 25% more sugar.D. Eating much more sugar can make mice put on weight and get high blood pressure.3.From the passage we can infer_______A. sugar plays a very important role in Americans’ dietB. kids consume more sugar than adults in AmericaC. the study on human beings lasted 58 weeksD. the genetic structure of mice is totally different from that of people4.What’s the best title of the passage?A. Living a sweet lifeB. Kids consume much more sugarC. Genetic structure of humansD. Danger of sugar