题目

有3种不同的原子,甲原子核内有6个质子和6个中子,乙原子核内有6个质子和8个中子,丙原子核内有7个质子和7个中子.下列说法正确的是（） A . 甲和乙是同一种元素 B . 甲和乙的核电荷数不同 C . 乙和丙核外电子数相等 D . 乙和丙互为同位素原子 答案：A阅读理解。     It is natural for young people, at times, to blame their parents for most of the misunderstandings between them. They have always complained that their parents are out of touch with modern ways; that they do not trust their children to deal with crises; that they talk too much about certain problems, and that they have no sense of humor, at least in parent-child relationships. I think it is true that parents often look down upon their teenage children and also forget how they themselves felt, when young.      For example, young people like doing things without careful consideration: it is one of their ways of showing that they can accept a challenge. Older people worry more easily: most of them plan things ahead, at least in the back of their minds, and do not like their plans to be upset by something unexpected.      So my advice to you is this: when you want to borrow the family car or get your mother to mend something for you, you will have better success if you can possibly ask in advance.      Young people often annoy their parents with their choices in clothes and hairstyles, in entertainers and music. This is not the main reason. They feel cut off from the adult world. So they create a culture and society of their own. Then, if it turns out that their music and entertainers, or vocabulary, clothes and hairstyles annoy their parents, this gives them additional enjoyment. They feel they are better, at least in a small way, and they are leaders in style and taste.      Sometimes you don't obey because you do not want your parents to accept what you do. If they did accept, it looks as if you are tricking your own age group. But in that case, you are supposing that you are the underdog: you can't win but at least you can keep your honor. This is a passive way of looking at things. It is natural enough, after long years of childhood, when you were completely under your parents' control. But it ignores the fact that you are now beginning to be responsible for yourself.      If you plan to control your life, co-operation can be part of the plan. You can impress others, especially parents, with your sense of responsibility, so that they will give you the right to do what you want to do.1. According to the passage, all the following complaints are true EXCEPT that ______. A. parents have no sense of humor at all B. parents are always behind the times C. parents talk too much about certain problems D. parents don't believe their children can deal with crises 2. What does the author suggest to young people to win support from their parents? A. Ignoring them. B. Controlling them. C. Entertaining them. D. Cooperating with them.3. We can learn from the passage that ______. A. young people are not allowed to join adult society because they have their own culture B. it is impossible for young people to get along well with older people C. older people tend to forget what they felt when they were young D. older people often lead the way in fashion4. The underlined word "underdog" in the 5th paragraph refers to a person who _____. A. keeps dogs as pets B. seems less likely to succeed C. likes to cheat his own age group D. looks down upon others around him