根据解释，写词语。
像晴朗的天空的颜色。____
请根据你在显微镜下观察口腔上皮细胞所看见的细胞结构，用铅笔在答题卡相应方框中画出一个口腔上皮细胞的结构图，并标注出细胞格结构的名称．
I think Chinese ____(字) are more difficult to learn than English.
