题干

下列说法中正确的是

A:“打开电视,正在播放《新闻联播》”是必然事件

B:想了解某种饮料中含色素的情况,宜采用抽样调查

C:数据1,1,2,2,3的众数是3

D:一组数据的波动越大,方差越小

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答案(点此获取答案解析)

B

同类题5

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    It was a Christmas night.I was an unlucky nurse who had to work on such a beautiful festival.When I was complaining about it,three people appeared at my desk﹣﹣a tired woman and two children

    "Are you all sick?"I asked doubtfully because they seemed all right.

    "Yes,"the woman answered weakly and lowered her head.

    But when they started to present their problems,things because unclear.One child had a fever,but his temperature was OK.The other child had an earache,but she could not tell me which ear hurt.It seemed that the mother was pretending to cough.

    Something was wrong.But I only explained that it might take a while before a doctor could meet them."Take your time,please,"said the mother.I checked their charts﹣﹣﹣no address.Suddenly I knew,they were homeless while the hospital was warm.

    The family huddled(卷缩)together under the Christmas tree,smiling and talking with each other sweetly.Quietly,I went back the nurses'station and told them what happened in the waiting room.It was just like God sending us a gift on Christmas Day.The nurses'station suddenly came back to life.All the nurses went into action for"a Christmas emergency".

    We took out our meals for our Christmas"patients".We also put together oranges and apples as presents.We tried to exceed the needs of a family who needed only a warm place on Christmas night.Later,the little girl kissed me and said,"Thanks for being our angel."