【多选题】【消耗次数：1】
皮肤可以抵御外来的哪些伤害？（）
①
A 水分流失
②
B 微生物感染
③
C 紫外线
④
D 灰尘和污染
参考答案：
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阳光中的紫外线照射到皮肤上可生成( )。
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随机题目
【单选题】
近代中国社会的主要矛盾是（）。
①
人民日益增长的物质文化需要同落后的社会生产力之间的矛盾
②
人民日益增长的美好生活需要和不平衡不充分的发展之间的矛盾
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中华民族伟大复兴需要同资本主义敌对势力的矛盾
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中华民族与帝国主义的矛盾以及人民大众与封建主义的矛盾