① Here's a card for you. ____                A. I love you, too.

② What do you like? ____                      B. Thank you.

③ I love you. ____                                   C. I like toy bears.

④ Don't throw stones. ____                     D. I have some bread and juice.

⑤ What do you have for breakfast?____  E. Yes, Mr. Li.

观察小鱼尾鳍内血液流动时，所用观察工具以及判断毛细血管的最好方法是（　　）

比一比，再组词

站____        澄____    

战____        瞪____

细胞能够正常地完成各项生命活动的最基本条件是（  ）