恩格斯指出，“随着自然科学领域中每一个划时代的发现，唯物主义也必然要改变自己的形式。”对这一观点理解正确的是（  ）

人每天约消耗的能量：10～13岁儿童____千焦。从事轻体力劳动的成人每天约需要____千焦的能量；从事重体力劳动劳动的成人每天需要____千焦的能量。

图中正确表示北半球水平运动物体偏转方向的是（虚线为原运动方向，实线为偏转方向）（　　）

通读全文，根据短文内容，选择正确答案填空。

    You are standing in the  1  and a voice says, "Put a little more salt to that soup." Yes, it's always nice to have   2  help you when you're cooking.   3  this voice is not from a person. Then  4 does it come from? Is it from a ghosts? No, this isn't a ghost kitchen-it's the kitchen of the future.

    Scientists are 5  to make everything in the kitchen  6  better. They are making a system (系统). It will help  7   cook a meal.

    The fridge of the smart kitchen has a scanner (扫描仪). It looks  8  the foods in the fridge. It will order more milk from the supermarket when there is no 9  in the fridge. It can do a lot of things. Even the knives and spoons will speak. For example, if your food is 10 , the knives and spoons will tell you not to eat it.

一个空瓶的质量时0.2kg，装满水后称得总质量是0.5Kg．用瓶装合金材质的固体颗粒若干，瓶和固体颗粒的总质量为0.9Kg．若在装固体颗粒的瓶中再装满水总质量为1.0Kg．（水的密度是1.0×10³kg/m³）求：

（1）瓶的容积；

（2）固体颗粒的质量；

（3）固体颗粒的密度．