题目

2008年9月27日，神舟七号航天员翟志刚完成中国历史上第一次太空行走，他相对地球行走了5 100 千米路程，用科学记数法表示为 ……………（     ）  A、51×102米   B、5．1×103米   C、 5．1×106米   D、0．51×107米 答案：C 根据对话内容，从方框内的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 A. Can I tell David about it? B. Who's that speaking? C. Do you have his telephone number? D. Can I take message?E. What's up?F. Would you like to go with us?G. Are you free tomorrow? A: Hello! 1_______B: Hello! Mike. This is Tom speaking. A: Hi, Tom. B: 2_______A: Tomorrow is Sunday. Yes, I am free. 3_______B: Jim, Jack, Linda and I want to have a picnic. 4_______A: I'd love to. What can I bring? B: Well, you can bring your guitar and kite. A: Sure, I won't forget them. 5_______ I think he would like to go, too. B: All right. Please ask him to bring some water. A.OK, thanks, Tom.