PASSAGE ONE According to the scientists, what causes the common occurrence of rickets among children?

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问题 PASSAGE ONE
According to the scientists, what causes the common occurrence of rickets among children?

选项

答案In sufficent exposure to natural sunshine and improper diet.

解析第二段中提到：The disease is caused by chronic vitamin D deficiencies，which carl be triggered by long periods out of natural sunlight and a poor diet. 可见长时间日照不足、饮食不合理，会造成长期的维生素D缺乏，从而诱发佝偻病。

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专业英语四级

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PASSAGE ONE According to the scientists, what causes the common occurrence of rickets among children?

专业英语四级

Researchershaveestablishedthatwhenpeoplearementallyengaged,biochemicalchangesoccurinthebrainthatallowittoact

Researchershaveestablishedthatwhenpeoplearementallyengaged,biochemicalchangesoccurinthebrainthatallowittoact

Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandareaoftheEarth—isavastfrontierthateventodayis

A.adequateB.adjustC.approachD.constructiveE.concentrationF.establishingG.includeH.learning

Storiespeoplehavewithreadingarenotnew,butthetrendisworsening.Recently,arecordhasshownthat10percentofthefr

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