—I'm a teenager's mother. Sometimes I don't know ____.—Maybe he suffers from stress.
A：what does my son want to get
B：what my son needs most
C：why is my son often angry
D：why my son gets angry very often
分子很小，看不见摸不着，但我们可以通过一些现象来认识它．如“满架蔷薇一院香”说明____；铅笔很难被拉断说明____．
“江西好人”、中学生邱艳芳，接连遭遇祖父、父亲去世的厄运，却依然笑对人生。她与生活不能自理的奶奶相依为命，悉心照顾奶奶，不离不弃，用自己稚嫩的双肩撑起一个破碎的家。邱艳芳的感人事迹启示我们要（ ）
关于世界海陆分布的说法, 正确的是 ( )
