沙漠中生长的仙人掌叶子变成叶刺，说明生物能够        环境。影响仙人掌生长的非生物因素主要是        ；而过度放牧会使草原沙化，说明生物也能影响和         环境。

根据下面图片以第一人称写一篇短文，词数80左右。开头已给出(15分)

I took part in a friend's birthday party in the evening. It rained when I went home. On my way back home. ____________________________________________________________________________________________

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