如图所示，用长为L的细绳拴着质量为m的小球在竖直平面内做圆周运动，则下列说法正确的是（   ）

    十九大报告指出“幼有所育”是保障和改善民生的重要内容。但“幼有所育”谁来育、怎么育，已成为公众关注的问题。

    据权威部门统计，全国婴幼儿在各类托育机构的入托率仅为4.1%，远低于一些发达国家50%的比例。“入托无门”成为很多0岁到3岁幼儿家长的心病。目前我国托育市场面临诸多问题。在经济体制改革过程中，大量事业单位办的福利性托儿所被裁减。随着二孩出生带来的学前教育资源紧张，很多地方公立幼儿园陆续取消原本针对两三岁儿童的“托班”，公办托育服务进一步萎缩。同时，我国托育市场目前尚无明确的审批和管理部门，多地教育部门称0-3岁的托育不归其主管，早已停止发放托儿所牌照。一些创办者因拿不到教育许可，转而去工商部门以“教育咨询机构”名义办理营业执照，但工商部门又表示，教育咨询机构不具备提供午餐、全日制托育资格。复杂的创办流程让民办机构望而却步。此外，由于缺乏准入、评定、考核等标准和政策支持，市场上托育服务的质量参差不齐，师资力量有的靠无保育资质的家政保姆。在硬件设施建设方面如果按照幼儿园建设标准，艰难有企业点、社区点的托育机构能够达标。

根据以下材料，选取角度，自拟题目，写一篇不少于800字的文章；文体不限，诗歌除外。

多数人有两个自己：一个是外在的、社会的、包装了的，一个是内在的、本质的、真实的。有人喜欢前者，有人钟爱后者，有人让两个自己不时地进行交流、融合……

已知p：关于x的不等式x²+2ax+4>0对一切 $x\in R$ 恒成立；q：函数f(x)=-(5-2a)^x在R上是减函数.若“p或q”为真，“p且q”为假，求实数a的取值范围（  ）。

    （I）It was a surprising announcement: SpaceX, a private company（私人公司）, said it would fly two people to the moon next year (2019). This has not been attempted since NASA's Apollo moon landings about 45 years ago. In the news conference, Elon Musk. SpaceX founder said two people have already paid SpaceX a “wonderful” amount of money to send them on a weeklong flight just beyond the moon.

    （II）Exercise reduces the risks of dying from all causes, including cancer and heart disease. But many people who work all week have little time for exercise. They try to take exercise or do chores to increase their heart rates over the weekend. A new study suggests that it is healthy to do that, which can reduce their risk of cancer and cardiovascular（心血管疾病）disease.

    （III）Scientists in London have found a possible way to solve the problem of plastic bottle waste. They have made a water bottle you can eat. The product is called Ooho, made of seaweed, a plant that grows in the ocean. Oohos are tasteless and look like bubbles or balls. They can hold water or any other liquid（液体）inside. When people drink Oohos, the outside bursts in the mouth and can be eaten. Even if you throw it away, it will degrade in about four weeks. It is good for the environment.