A:总体是指这箱1000袋方便面
B:个体是一袋方便面
C:样本是按2%抽取的20袋方便面
D:样本容量为20
解释下列词语。
① 意在笔先:____
② 情不自禁:____
③ ③另眼相看:____
染色体主要由____和____组成.
— My cousin is good at all his subjects at school, but he never ________.
— What a ________ boy! We should learn from him.