人体细胞的各项生理活动都离不开能量，能量的获得与人体的整体生理活动息息相关，如图是人体的部分系统和器官，每一个细胞能量的获得都离不开它们的生理作用，请回答下列问题：

综合学习与探究。
        文言文是我们中华民族宝贵的精神遗产，司马迁注意到陈胜的“鸿鹄之志”；柳宗元倾听蒋氏的痛苦诉说，“闻而愈悲”；范仲淹写出两种不同的览物之情后慷慨陈述心志；欧阳修之乐意味深长；吴均则尽情描述自然美景，流露出远离名利官场的愿望……学习文言文，我们既要读通读顺，也要探讨研究，了解古人的精神追求。

根据短文内容，用方框中所给单词的适当形式填空，每词限用一次。                                                                                     

    Do you love animals? Would you like to keep animals as a pet? Nowadays, many people like to keep pets at home. The most popular____  are cats and dogs. They are friendly to people, and they are also ____  to take care of. Some people like parrots as pets. Pets lovers will____ lots of things for their pets, such as beds, clothes and even toothbrushes. Pets are very useful, too. The people who can’t hear need the dogs' help to answer the door. And the people who live____  should keep a pet if he wants to be healthier and ____ . If you have pets, don't forget to spend more time with them. They need love, too.

中国古人在中医学天人合一的理论基础上，把节气变化与饮食养生结合起来，所谓“春不食肝，夏不食心，秋不食肺，冬不食肾，四季不食脾，如能不食此五脏，乃顺天理”。从辩证法的角度看，这一认识强调（  ）

①要善于把握事物存在发展的不同条件

②不同的人应该有不同的饮食习惯

③不同季节中有饮食的普遍规律

④要在共性要求中把握不同的饮食特点