题目

已知复数满足（为虚数单位），则的虚部为_______. 答案：【答案】5.【解析】利用复数的运算法则、虚部的定义即可得出.设，则，，则，故答案为：5.D There are many types of reports. A report is simply an account of something that has happened. The commonest are news reports. We get them in newspapers, over the radio and on television Sometimes cinemas also show us newsreels. The main purpose of a newspaper is to provide news. If you examine a newspaper closely,   you will find that there are all types of news, accidents, floods, fires, wars, fashions, spoils,books, etc. The news covers everything that happens to people and their surroundings. Some-times there are news items which are very amusing. A news report is usually very short, except when it is about something very important, but it contains a lot of information. It is also written in short paragraphs. The first paragraph is in facta summary of the news item. It gives all the necessary information -what, when, where, howand why. The other paragraphs give full details of the subjects. There may also be interviews with people. The words actually spoken by them are written in inverted commas(引号). Often there are photographs to go with the news to make it more interesting.53. The easiest way to get today's news is _______ A. to go to the cinema                  B. to watch a color TV C. to read today's newspapers          D. to listen to music over the radio54. Newspapers sell well mainly because _______ A. they cost very little                        B. they are easy to get C. they have got pictures to go with the news   D. they provide all sorts of news in them55. If you want to get enough information about yesterday's traffic accident within a very short time, you can __ A. read the first paragraph of the news report in today's newspaper B. start with the second paragraph of the news report in today' s newspaper C. look through the whole news report in today' s newspaper D. talk with people who have seen the accident56. To interest more people, a news report __ A. usually produces amusing news B. always writes very short news reports C. often prints pictures to go with the news D. sometimes provides long and important news57. This passage mainly talks about __ A. different types of reports                    B. news reports C. happenings to people and their surroundings    D. the length of a news report