题目内容

In recent years, global warming is becoming a concern for people all over the world. It generally causes by the 1._________ in the amout of carbon dioxide(二氧化碳）and other greenhouse gases(温室气体）in the atmosphere. In fact, it's the human activities that lead to these gases. The 2._of fossil fuels such as, 3.and oil is one of the best-known causes for global warming. The bad effects of global warming are alarming. Even a rise of three degrees could 4.in raising sea levels. What's worse, storms and floods will become more 5._____. Now it's high time that we took some measures to protect our planet.

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