压强：物体所受____与____ 之比叫压强，公式=____，公式中压强р的单位是____ ，压力F的单位是____ ，受力面积S的单位是　____．

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

    Long ago there was a poor farmer called Fred. Fred and his wife Doris lived ____(happy) together in their small old house. One winter night, the Luck Fairy visited ____.

    “Fred, you're a good farmer. I'd like to give you a wish,” said the Luck Fairy.

    “A wish?” said Fred.

    Fred and Doris smiled ____each other. Then Fred said, “Thank you, Luck Fairy. We're very healthy and happy.”

    “You work very hard ____you make very little money. Would you like some gold coins?” asked the Luck Fairy.

    “We're poor, but we have enough food ____(eat).” replied Fred.

    “You can use the gold coin to buy ____clothes. The winter here is very cold,” said Luck Fairy.

    “____ we haven't got many clothes, we've got enough.” said Doris.

    “Well, what about ____nice new house?” asked Luck Fairy.

    “Thank you, but I love my small old house very much. I ____(live) here since I was born. We don't need a new house,” said Fred.

    “You're quite different ____others. I like you very much,” said the Luck Fairy. “I wish you happy forever.” Then the Luck Fairy disappeared and never came back.

材料一：2016年4月26日，《中共中央国务院关于全面振兴东北地区等老工业基地的若干意见》（以下简称《意见》）对外发布。《意见》指出，切实解决好社保、就业等重点民生问题。加大民生建设资金投入，全力解决好人民群众关心的教育、就业、收入、社保、医疗卫生、食品安全等问题，保障民生链正常运转。采取务实举措，做好增收节支，坚决压缩一般性支出，切实保障各项民生重点支出。中央财政对企业职工基本养老保险的投入继续向东北地区倾斜，进一步提高企业退休人员基本养老金水平，妥善解决厂办大集体职工的生活困难和社会保障问题。坚持就业优先，制定具体措施，加强专业培训，重点做好高校毕业生就业和失业人员再就业工作，帮助就业困难人员实现就业，确保零就业家庭实现至少一人就业。稳定城乡居民就业和收入，确保社会和谐稳定。

材料二：《意见》指出，对接京津冀等经济区构建区域合作新格局。推动东北地区与京津冀地区融合发展，在创新合作、基础设施联通、产业转移承接、生态环境联合保护治理等重点领域取得突破，加强在科技研发和成果转化、能源保障、统一市场建设等领域务实合作，建立若干产业合作与创新转化平台。支持辽宁西部地区加快发展，打造对接京津冀协同发展战略的先行区。加强与环渤海地区的经济联系，积极推进东北地区与山东半岛经济区互动合作。支持东北地区与长江经济带、港澳台地区加强经贸投资合作。深化东北地区内部合作，完善区域合作与协同发展机制，支持省（区）毗邻地区探索合作新模式，鼓励开展协同创新，规划建设产业合作园区。加快推动东北地区通关一体化。