问题
填空题
请你用微粒的观点解释以下现象。
（1）妈妈在厨房里炒菜，我在窗外就闻到了香味。 。
（2）如图所示，两支医用注射器，分别吸入等体积的空气和水，用手指顶住末端注射孔，将栓塞慢慢推入，哪支容易推压？为什么？ 。
答案
(1) 分子在不断地运动 （2） 装空气的那支气体的分子间隔比液体的分子间隔大
搜题请搜索小程序“爱下问搜题”
请你用微粒的观点解释以下现象。
（1）妈妈在厨房里炒菜，我在窗外就闻到了香味。 。
（2）如图所示，两支医用注射器，分别吸入等体积的空气和水，用手指顶住末端注射孔，将栓塞慢慢推入，哪支容易推压？为什么？ 。
(1) 分子在不断地运动 （2） 装空气的那支气体的分子间隔比液体的分子间隔大
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| There are seas, lakes and forests on the earth. There are cities, towns and farms, too. All these things are environments. The environment is everything around you. It can be living (有生命的), like a forest. It can be non-living (无生命的), 1 a rock or a mountain. No living thing can live alone. Every living thing depends (依赖于) on other things in its environment. When something 2 , it affects (影响) something else. If a non-living; thing like water becomes 3 to find, plants will be affected. If all plants 4 , the animals that eat plants will be affected. Weather, such as temperature, wind and rain, can change an environment. 5 can change an environment, too. Some things that people do cause no change or only a small change in the environment. For example, people can walk through the forest and just travel around. They can cut down only a few trees and 6 change the environment very much. On the other hand, some things that people do cause 7 changes. Sometimes they can change a whole environment by cutting down a forest. Not all changes are bad. If we cut down a forest to build houses or plant crops, this may not be bad. But what would happen if we cut down all trees in all forests or if we didn't 8 them and plant something else? It is clear that people are able to change an environment. This is why it is important to think about the changes before we make 9 . Let's work together to 10 it clean and healthy. | |||
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