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中央电视台“情系玉树”赈灾晚会共筹得善款2 975 000 000元，这个数据用科学记数法可表示为______元．

答案

将2 975 000 000用科学记数法表示为：2.975×109．

故答案为：2.975×109．

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缺词填空(10分)

Sally was a student in a small town. It was going to be her mother’s birthday. She wanted to buy her a present that would be nice and useful but not e       .

She went s     after a quick and simple lunch. After she looked for about forty minutes, she found a shop that was selling cheap umbrellas(雨伞), and she d       to take a black one. She thought, “Mom can carry it when she is w________ clothes of any color.” So she bought a lovely black umbrella and took it to school with her until her class finished. On her way home on the train she felt h       So she went to the buffet car (餐车). She left the umbrella on her s     . But when she returned, it had gone. Sally began to cry. The o_______ passengers(乘客) felt very sorry for her and asked what was the matter. She told them the black umbrella she bought for her mother had gone, and she had to get off at the next station. After the three passengers h______      this , they asked her for her mother’s address(地址) so that(为了) they could send the umbrella to her if someone took it by mistake (弄错) and brought it b       

And now a week passed. Sally g______ a letter from her mother. It said, “Thank you very much for your lovely presents, but why do you send me three black umbrellas?”
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单项选择题

以下关于查询描述正确的是【 】。

A．不能根据自由表建立查询

B．只能根据自由表建立查询

C．只能根据数据库表建立查询

D．可以根据数据库表和自由表建立查询
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