题目

选择正确答案( ) 1. A: __________            B: Nice to see you, too.A. Nice to see you. B. How are you? C. How do you do!( ) 2. A: Here you are.           B: __________A. That's right. B. Let me see. C. Thanks.( ) 3. A: ________           B: He's tall.A. Is the boy tall or short? B. Is the boy tall? C. Is the boy short?( )4. A: Would you like an egg and some fish?              B: ________A. No, please, I'm full. B. That's a good idea. C. OK. I'd love to.( ) 5. A: Thank you, Kangkang.            B: ________A. Not at all. B. Of course2005年10月12日至10月17日，我国载人航天飞船--“神舟“六号飞行任务取得圆满成功，标志着中国载人航天事业已跨入第二阶段，这次“神舟”六号共航行了3 384 500千米，用科学记数法表示为______千米，保留三个有效数字表示为______千米，精确到万位表示为______千米．