environment - The place (land,water and air) where people and animals live , pollute - to make something dirty, shortage - when you have little of something, dump - The place where we bring and leave our rubbish, poison - something which can kill you if you eat it, population - People who live in one country, weapon - It is used to kill people in a war, survive - people can`t ..... without water and food , safe - not dangerous, resources - Gas and oil are natural .....,

Ecology

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恢復自動保存: ?