These pictures show the of life. Who them?
A：beauty; painted
B：beauty; were painted
C：beautiful; painted
D：beautiful; were painted
依照你在显微镜下观察到的蚕豆叶切片中叶肉细胞的结构，用铅笔在答题卡相应方框中画一个叶肉细胞结构简图，并标注出细胞各结构的名称．
塑料的特性有哪些？
