【判断题】【消耗次数：1】
敬语正确使用：加强修养、恰当使用、养成习惯
①
正确
②
错误
参考答案：
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【单选题】
学前儿童养成良好的用眼习惯，以下说法正确的是（ ）
①
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②
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③
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④
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【单选题】
学前儿童养成良好的用眼习惯，以下说法正确的是（ ）
①
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable
【单选题】
学前儿童养成良好的用眼习惯，以下说法正确的是（ ）
①
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable
【单选题】
使用含氟牙膏防龋，正确的是
①
氟牙膏的防龋功效与含氟浓度的高低无关
②
在饮水含氟量高的地区，7岁以下儿童推荐使用含氟牙膏
③
儿童使用含氟牙膏不会引起氟牙症
④
老年人不宜使用含氟牙膏
⑤
6岁以下的儿童宜使用含氟浓度低的牙膏
随机题目
【多选题】
一个完全竞争的市场结构，必须具备下列条件（ ）
①
市场上有无数多家生产者与消费者
②
行业中厂商生产的产品是无差异的
③
厂商和生产要素可以自由流动
④
购买者和生产者对市场信息完全了解
【判断题】
<img src=http://p.ananas.chaoxing.com/star3/origin/4c7b3447f458110ba22658e9950a9a5c.png/>
①
正确
②
错误