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问题 填空题

用科学记数法表示9400000=______，保留两个有效数字后≈______．

答案

9400000=9.400000×106，保留两个有效数字后9400000≈9.4×106．

故答案为9.400000×106，9.4×106．

补全对话，情景问答

阅读对话，填写适当的单词使对话完整通顺。每空一词。

A: Hi, Tina! I haven't 1______ you for a long time. 2______ have you gone?

B: Oh, I've been to Australia 3______ vacation. I had a great 4______ there.

A: That's great! I hope one day I will go there, 5______.

B: What have you been 6______ these days?

A: I've been 7______ for a job. I like to travel so I want to be a 8______ attendant.

B: Have you got the job?

A: I'm afraid not. These days I have been 9______ English at a language school. 10______ I have to

    speak English well if I want to get the job.

B: Well, I hope you can improve your English soon.

A: Thank you!

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单项选择题

在一次聚会上，张某发现刘某的手机是自己不久前丢失的。事实是，该手机是王某在公交车上捡到后卖给刘某的，交易时刘某对此并不知情。据此，我们可判定（）

A、王某应承担道义责任，但不需承担法律责任

B、刘某属于善意第三人，已取得该手机所有权

C、张某是手机所有权人，可请求刘某归还手机

D、刘某应归还张某手机，张某须返还刘某购机款
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