A．物体漂浮，F_浮=6N   B．物体悬浮，F_浮=5N   C．物体漂浮，F_浮=5N   D．物体沉底，F_浮=6N

理由：____．

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    Philip is a school boy. On his twelfth birthday, he decided to give up eating 1.

    "I don't think it's right to eat animals," he said. "They live on the Earth just like us and they are our friends." Philip's parents were not happy about that. "You are a growing boy," his mother said "You need meat. Don't you want to become healthier and 2?" His mother put some 3, rice and carrots in front of him. "I want you to eat all your food now," she said. "Don't 4 anything." Philip didn't want to make his mother sad. But he ate only the rice and the carrots without touching the beef.

     "You're a silly boy!" said his father 5. "I'm getting very angry with you."

     "I'm sorry, Mum and Dad," answered Philip. "I don't want you to be sad or angry. 6 I really don't want to eat any meat. "

     "Then have some fish, dear," said his mother.

     "Oh no, I can't!" cried Philip. "Fish are living things, too.

     "Well, you can't have 7 to eat at all if you don't eat any meat or fish," said his father.

    The next morning Philip got up hungry. His father walked to the 8 with him and asked to see the teacher. "Is this what you teach the students at school" he asked the teacher. "Philip 9 to eat meat at home. He doesn't listen to what I say. "

    "I don't agree with Philip," replied the teacher. "But I think he is 10 to do what he thinks is right. We teach the students to do that."

阅读《“微信控”们请抬抬头》，回答后面问题。
        ①不管是亲戚吃饭还是朋友聚会，常常是几个人围坐在一张桌子旁，但彼此之间都不说话，只自顾自低着头摆弄手机，不停地微信，语音，自拍，刷屏。越来越多的人使用微信与其他人进行沟通交流，微信像一块吸引力巨大的免费蛋糕，吸引了众多的勤劳的“低头族”。控，出自日语“コン（kon）”，取complex（情结）的前头音，指极度喜欢某样东西的人。“微信控”，就是有微信情结的人。
        ②微信作为一种网络社交工具，刚一问世就得到了广泛应用。人们利用手机上安装的微信，可以做到及时沟通、聊天、随时发布自己的状态。每天到“朋友圈”里逛一逛，不仅能了解亲朋好友的资讯，还能看到各种信息，给生活带来了便利。它更满足了人们深层次的心理需求——关注与被关注。按照马斯洛的“需求层次理论”，当生存的需要获得满足时，就需要满足更高层次的要求。而归属感、认同和自我实现都是较高层次的需求。“微信控”正是通过“晒”来让朋友们找到谈资、了解近况，通过得到朋友认同和关注来满足这些高层次需求。
        ③但是，任何事物都有其两面性。过度依赖微信，每天沉迷于“刷朋友圈”、“狂点赞”，熬夜玩微信，甚至一天不玩微信就会出现烦躁、空虚等反应。这样，在一定程度上会削弱人们在现实生活中的人际交往能力，成为网络中的社交高手，现实社交的“低能儿”。
        ④另外，经常长时间盯着手机屏幕，对视力也会造成伤害。据调查显示，青少年出现近视的原因中85%到90%是因为用眼过度。近视的患者，绝大部分天天接触电子产品，而且每天玩半个小时以上。眼睛的泪膜层遭到破坏，导致泪液分泌减少，从而出现干眼症。长时间低头玩手机还会出现颈椎椎间盘突出、后颈部肌筋膜炎等病症，导致颈后部肌肉和韧带牵拉劳损。
        ⑤如何才能降低对微信的依赖度呢？首先，要认识到这些网络工具之所以被研发出来，是为了更好服务人类，而不是用来控制人类；其次，应强制自己合理有度地使用网络工具，将更多的时间用在与周围人的面对面交流上；另外，加强体育锻炼也可帮助减弱“微信控”。