题目

科学探究的一般步骤顺序是（） ①制定计划 ②发现问题并提出问题③得出结论④作出假设 ⑤表达交流⑥实施计划． A . ②④①⑥③⑤ B . ②④①⑥⑤③ C . ④②①⑥⑤③ D . ①②③④⑤⑥ 答案：AThe number of overweight people around the world is increasing. For example, in China the number rose from 9 percent to 15 percent between 1989 and 1992. The increases in Latin America and Europe were similar. However, the most worrying statistic is the increase in the number of overweight children. In America, almost 33 percent of children under five are overweight. In some parts of Europe, the rate is almost 30 percent. Even developing countries have problems. In Egypt, Chile and Armenia, for example, the rate is over 5 percent.The problem is the change in our diets combined with the change in our lifestyles. We used to eat whole grains, vegetables, and fruit. Now we eat foods that contain a lot of fat and sugar. Experts(专家) say that it isn't surprising that people eat too much of the wrong foods. Everywhere we look there are advertisements for high-calorie, high-fat foods. These foods are low in nutrition but also low in cost. In other words, they may not be good for us, but they are really cheap. Some experts call this a toxic-food(有毒的食品) environment. Most of us do not realize this unhealthy environment. Therefore, we believe if we are fat, it's our responsibility. This is not completely true.Today, many food companies are focusing on developing countries. In 1998, one soft-drink company told its employees that "Africa is a land of chance for us." The largest American fast-food company opens five new restaurants every day; four of them are located outside the United States.It is terrible to think that we may soon live in a world where everyone eats fast food and drinks soda. However, it is not unavoidable. Governments should educate their people about the dangers of eating the wrong food. This is particularly important for tomorrow's adults.【1】The numbers in Paragraph 1 are used to show ________.A. the overweight problem B. the increase in populationC. the effects of being overweight D. the problems in developing countries【2】It can be inferred from the text that food advertisements ________.A. cause food prices to rise B. often give people useful informationC. affect the development of the food industry D. are partly responsible for overweight people【3】What is the text mainly about?A. Advertisements and life. B. Being overweight and its reasons.C. Modern lifestyles and their effects. D. Being overweight and the environment.