如图是人体结构层次图，请分析并回答问题．

（1）①②③过程表示细胞____ ，在此过程中，细胞核内的____ 复制后形成相同的两等份，分别进入两个新细胞．

（2）④过程表示细胞____ ，在图中的各种组织，具有保护和分泌作用的是____ ____ 组织，能传导神经冲动的是____ ____ 组织．

（3）人体的结构层次是：细胞→组织→____→____ →人体．其中，人体具有而植物没有的是____ ．

血液中的二氧化碳扩散进入肺泡内，需要经过几层细胞（   ）

    Can animals have their festivals today? Yes, of course. And many1have their special animal festivals to show love to different animals.

    In Canada, the second Sunday of October is just Canadian Dog's Day. On that2, all the Canadian dogs can enjoy the time. Dogs play an important part3Canadians' life because they think dogs are very kind to4and help do much work. The dogs can pull a sled (拉雪橇), carry things and many 5useful things.

    In Belgium (比利时), the second Sunday of May is Cat's Day. People there play some interesting games with6for fun. They hope, in the next year, they will be7and have a good result.

    In Indonesia (印度尼西亚) , May 7th is Monkey's Day. People8many candies and nuts (坚果) to monkeys. They also play music for the animals. All the monkeys will have a9time on that day.

    We live in the same world with animals.10we have to be friendly to them. And we should get along very well with them.