4.c【解析】本题考查生物膜系统与细胞自噬机制。自噬体是由双层膜结构包裹损伤的蛋白质、细跑器等形成的,有双层或多层膜的液泡状结构,没有颜色,普通光学显微镜下观察不到自噬体的形成,A、B正确;细胞自噬不会诱导癌细胞凋亡,C错误;由题可知,细胞自噬降解损伤的蛋白质、细胞器或入侵的病原体,且物质被降解后得以循环利用,D正确。

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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