题目

如图是关于分子动理论的三个实验：图A所示的实验现象说明_______________________________________________.图B所示的实验现象说明_____________________________________________．图C所示的实验现象说明__________________________________________________． 答案：【答案】 分子在永不停息地做无规则运动 分子间存在引力 分子间存在空隙【解析】（1）红墨水滴在清水中，整杯水变红，是因为分子在永不停息地做无规则运动。（2）两铅块挤压后能吊住大钩码，不易分开，说明分子间存在着相互作用的引力。（3）一半酒精和一半水混合后总体积变小，是因为分子Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds;  (2)citrus （柑橘）fruits and tomatoes; (3) potatoes and other fruits and vegetables ; (4) meat of all kinds, fish and eggs; (5) milk and foods made from milk; (6) bread or cereal (谷物), rice is also in this kind of foods; (7) Butter or something like butter. People in different countries and different places of the world eat different kinds of things. Foods are cooked and eaten in many different kinds of ways.  People in different countries eat at different times of the day. In some places people eat once or twice a day; in other countries people eat three or four times a day. Scientists say that none of the differences is really important. It doesn’t matter whether foods are eaten raw or cooked, canned or frozen. It doesn’t matter if a person eats dinner at 4 o’clock in the afternoon or at eleven o’clock at night. The important thing is what you eat every day. There are two problems, then, in feeding the large number of people on earth. The first thin g is to find some ways to feed the world’s population so that no one is hungry. The second is to make sure that people everywhere have the right kind of food to make them grow to be strong and healthy.小题1: According to the scientists, which of the following groups of food is the healthiest for your lunch?A．chicken, apples, cereal, cabbages. B．potatoes, carrots, rice, bread.C．oranges, bananas, fish, tomatoes.D．beef, pork, fish, milk小题2: It is important for people to eat __________.A．three times a dayB．dinner at twelve o’clockC．cooked food all the dayD．something from each of the seven kinds of food every day.小题3:People in different countries and different places of the world________________.A．have the right kinds of food to eatB．cook their food in the same wayC．have their meals at the same timeD．eat food in different ways.小题4: Which of the following is NOT true?A．People in some places don’t have enough to eat.B．There are too many people in the world.C．One of the problems is that no one is hungry.D．The scientists are trying to make people e grow to be strong and healthy.小题5:If there is paragraph 4, what do you think is going to be talked about?A．When people eat their lunch. B．What to do with the two problems.C．How to cook food in different ways. D．Why people eat different kinds of food.