【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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【填空题】
幼儿骨的有机物含量较( ),无机盐含量相对较( ),所以幼儿骨的弹性大,柔韧性强,而硬度小,容易弯曲变形,不易骨折,一旦骨折,易发生( )现象。<img class="questionIndex" data-index="1" src="/common/images/question_button/BlankSpace1.gif"/><img class="questionIndex" data-index="2" src="/common/images/question_button/BlankSpace2.gif"/><img class="questionIndex" data-index="3" src="/common/images/question_button/BlankSpace3.gif"/>