完型填空

    Good evening, everyone! Today, I'm very glad1a speech. 2name is "My Dream". We know everyone has his or her own dream. Some people want to be basketball players because they are good 3sports. Some would like to become 4because they like to stay with children. Do you know5 I'm going to be when I grow up? I like cooking, 6. I want to become a good cook. I think I must have great7 cooking food. I'd like to ask everyone to taste my food. I also like seeing their smiling faces after8the delicious food. However, it's not so9 to be a good luck. I decided to learn10 things about cooking from now on. I will work hard for my dream. I'm sure I will succeed (成功) some day.

随着科技发展，新材料、新技术不断服务于人们的生活，许多电子设备用到热敏电阻、光敏电阻等电路元件，它们是用下列哪种材料制成的 （    ）

钓鱼岛是我国固有领土，钓鱼岛附近海域蕴藏着丰富的海底石油和天然气，并且是我国东海靖渔场．我国福建，浙江和台湾等地的渔民经常到这一带捕鱼请回答：
（1）钓鱼岛附近水域海底蕴藏的天然气主要成分是____（填化学式），石油属于____（填“纯净物”或“混合物”）
（2）我国渔民在这一带捕获的鱼类含有丰富的营养价值，鱼肉是人体很好的____（由氨基酸构成的营养素）来源，鱼鳞中含有多种不饱和脂肪酸和丰富的多种微量矿物质，其中钙，磷含量较高，此处钙，磷是指____（分子、原子、元素）．
（3）海水中含有很多杂质，取一杯浑浊的海水，若要使其变得澄清，所需要的操作方法为____；若要使其变成较纯净的水，需要的操作方法为____ 

①求金属块A受到的浮力F_浮

②求水对容器底部的压力F_水

③现将绳子剪断，求绳子剪断后容器对水平地面压强变化了△P。