题目

已知复数z与(z+2)2-8i均是纯虚数,则z=_______________. 答案：思路解析:设z=bi(b∈R,b≠0),则由(z+2)2-8i=4-b2+(4b-8)i是纯虚数,得b=-2.答案:-2iIt is natural that young people are often uncomfortable when they are with their parents. They say that their parents don’t understand them. They often think that their parents are out of touch with modern ways, that they are too serious and too strict with their children, and that they seldom give their children a free hand.It is true that parents often find it difficult to win their children’s trust and they tend to forget how they themselves felt when young. For example, young people like to act on the spot without much thinking. It is one of their ways to show that they have grown up and they can face any difficult situation. 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. When you want your parents to let you do something, you will have better success if you ask before you really start doing it.Young people often make their parents angry with their choice in clothes, in entertainment and in music. But they do not mean to cause any trouble: it is just that they feel cut off from the older people’s world, into which they have not yet been accepted. That’s why young people want to make a new culture of their own, and if their parents do not like their music or entertainment or clothes or their way of speech, this will make the young people extremely happy.Sometimes you are so proud of yourself that you do not want your parents to say, “Yes” to what you do. All you want is to be felt alone and do what you like. It is natural enough, after being a child for so many years, when you were completely under your parents’ control. If you plan to control your life, you’d better win your parents over and try to get them to understand you. If your parents see that you have a high sense of responsibility, they will certainly give you the right to do what you want to do.1.________are to blame for the quarrels between parents and their children according to this passage.A. Only parentsB. Young peopleC. Both parents and their childrenD. Neither parents nor their children2.According to the passage, young people prefer to _________.A. do things without thinking carefully ahead.B. ask for advice before they really start to do anything.C. think in the same way as their parents do.D. be very strict with themselves3.According to the passage, young people want to make a new culture of their own because________.A. they don’t feel they belong to the world of the older people.B. they do not want to get into trouble.C. they feel they are as clever as old people.D. they want to show they have grown up.4.The underlined word “this” in the third paragraph stands for _______.A. the young people’s choiceB. their being accepted by their parentsC. developing a new culture of their ownD. their parents’ dislike of their choice5.If a young man intends to control his own life, it’s better for him to _______.A. do everything according to his own wish.B. be responsible for what he doesC. do everything beyond his parents’ controlD. do everything the way his parents do.