叶绿体和线粒体的功能是:( ) A. 保护细胞 B. 储存遗传物质 C. 进行物质交换 D. 进行能量转换 答案:D英译汉。1.Don’t walk!_________________________________2.Look left._________________________________3.Look right._________________________________4.Dno’t litter!_________________________________5.No swimming!_________________________________