题目

已知a∈R，若a–1+(a–2)i(i为虚数单位)是实数，则a=（    ） A 1                                  B. –1                                 C. 2                                   D. –2 答案：C 【解析】 【分析】 根据复数为实数概念列式求解即可. 【详解】因为为实数，所以 故选：C 【点睛】本题考查复数概念，考查基本分析求解能力，属基础题.单词拼写。     根据下列各句句意和空白之后的汉语提示词，在横线上写出对应单词的正确形式，每空只写一词。1. On the way to the station, he ___________(闲聊) about their trip.  2. At school, they had learned that most Canadians live _______(在……范围内) a few hundred    kilometers of the USA border.3. Fruit juices can be ________(有害的) to children's teeth.  4. Water had also appeared on other planets like Mars but ________(不像) the earth. 5. He has been working on a new _______(小说) recently. 6. Have you ever heard of the saying, 'A friend in need is a friend ________(真正地)'?  7. It's your fault. Go and ___________(道歉) to her.   8. He pushed against the rock with all his __________(力气). 9. It's the _______(习俗) in that country for women to marry young.  10. For _______(显而易见的) reasons, I'd prefer not to give my name.