①心脏    ②血液  ③神经元  ④一株蒲公英   ⑤细胞内蛋白质等化合物

⑥噬菌体  ⑦同一片草地上的所有山羊  ⑧一个湖泊  ⑨一个池塘的所有生物 ⑩一片草地的所有昆虫．

组成肺的最小的结构和功能单位是____、

Welcome to the City Zoo! There are many1in the zoo. Let’s see the koalas first. Koalas are2Australia. They are quiet,3and cute. Children like them very much. The kangaroos (袋鼠) are also from4. They are quiet and interesting,5they are not friendly.
The giraffes come from Africa. They have a6neck (脖子). They like to eat leaves. The lions are also from Africa. They are exciting, but a little7. Many people don’t like8. We also have pandas. They are from China. They are very cute and friendly, but they are very shy. So please be9.
Have10and enjoy yourself here!

  10＋2－8＝（  ）