“呦呦鹿鸣，食野之蒿”。这个名字和这种植物，两千多年前就以奇特的方式联系在一起。

材料一：越战期间，耐药的恶性疟疾流行，中国在越共的请求下开始抗疟药的研究。屠呦呦在重新复习东晋葛洪《肘后备急方》时，发现其中记述用青蒿抗疟是通过“绞汁”，而不是传统中药“水煎”的方法来用药的。据此，她“改用低沸点溶剂，果然药效明显提高”。经过反复试验，最终分离获得的第191号青蒿中性提取物样品，显示对鼠疟原虫100%抑制率的令人惊喜的结果，并最终用X-衍射方法确定了青蒿素的立体结构。

材料二：全球年约三亿多人感染疟疾，氯喹等因疟原虫对此产生抗药性而失效。由“523”办组织全国七大省市筛选中草药3200多种，亦有人做过青蒿，认为无效而放弃。后在屠呦呦的带领下，再次研究青蒿，不断改进提取方法，经大量实验及试服，抗疟新药青蒿素诞生！之后，上海无机化学所测定了青蒿素的化学结构，并发现了其抗疟机理。

材料三：在***的号召下，总后勤部、卫生部、国家科委、军事科学院等多个部委，共同筹备了这场国家任务——研发新型抗疟药，屠呦呦就是在这一形势下开始了青蒿素的研究。经她发现的青蒿素，数十年来已拯救过全球数百万名疟疾患者的生命。在拉斯克奖评审委员会的描述里，屠呦呦是一个靠“洞察力、视野和顽强的信念”发现了青蒿素的中国女人。2015年12月10日，屠呦呦出席诺贝尔颁奖典礼时表示：我再次衷心感谢当年从事523抗疟研究的中医科学院团队全体成员，铭记他们在青蒿素研究、发现与应用中的积极投入与突出贡献。

 Would you eat a ready meal from the fridge rather than cook by yourself ? Have you been doing Internet shopping rather than going to the stores?

 A study into how lazy British people are has found more than half of the adults are so lazy that they'd catch the lift rather than climb two flights of stairs.

 Just over 2,000 people were quizzed by independent researchers in the Britain's largest health center. The results were very surprising.

 About one in six people who were asked said if their control was broken, they would continue watching the same channel rather than get up.

  More than one third of those asked said they would not run to catch a bus. Worryingly, of 654 respondents (离婚被告) with children, 64% said they were often too tired to play with them.

  We know that it's no wonder that one in six children in the UK are very fat before they start school.

  Dr Sarah, Dauncey, medical director of the center, said, “People need to get fitter, not just for their own health, but for their families, friends and pets, too.”

 “If we don't start to take control of this problem, a whole generation will become too unfit to perform even the most basic tasks.”

  And Scotland's largest city, Glasgow, was shamed as the laziest city in the UK, with 75% asked thinking they do not get enough exercise, followed by Birmingham and Southampton, both with 67%.

  So there are some problems for the National Health Service, where fatness-related (相关的) illnesses such as heart disease and cancer have been on an increase for the past 40 years and are costing billions of pounds every year.

若点（3，1）是抛物线y²=2px的一条弦的中点，且这条弦所在直线的斜率为2，则p=____