閱讀下面的短文．并根據(jù)短文后的要求答題。
Since 1850．the temperature of Earth’s surface has increased about 0.6°C．Scientists predict it may warm much more by the end of this century．Who’s turning up the heat? Well, it seems that we are! Some of this global warming may be natural．However，nearly all scientists now agree that most of it is due to peoples actions．Over the past 150 years, we've added huge amounts of certain gases, especially carbon dioxide（CO2）to the air．These gases can keep heat near Earth's surface，so more carbon dioxide means more heat is kept near Earth's surface．Global warming may change the weather in ways that lead to more severe storms，floods and droughts．
We add carbon dioxide to the air when we burn things, especially fossil fuels．Fossil fuels are energy sources formed from the remains of plants and animals that lived millions of years ago．Coal，oil，and natural gas are all fossil fuels．People in the United States and other countries started bunting large amounts of fossil fuels more than a century ago．The amount d fossil fuels being burned each year has been increasing worldwide．The more we burn，_____________________．
What can we do to help? Nowadays to live a low-carbon life is quite popular in the world． Low-carbon means to reduce the amount of carbon dioxide．Saving energy and reusing are the key words. In fact, even the simplest everyday activities can make our lives low-carbon．
1．What problem can global warming cause?（根據(jù)短文內(nèi)容回答問題）
2．What are fossil fuels?（同上）
3．請將第一段中的劃線句子翻譯成漢語。
4．請根據(jù)第二段內(nèi)容，將最后一個句子補充完整。
The more we bum，_____________________________________________.
5．請寫出日常生活中的一種“低碳”行為（用英語寫一個句子）。

1．Global warming may change the weather in ways that lead to more severe storm，floods and droughts．（2分）
2．Fossil fuels are energy sources formed from the remains of plants and animals that lived millions of years ago．／Coal，oil，and natural gas are all fossil fuels．（2分，兩個句子回答任何一個或兩句都有．均可得2分）
3．在過去的150年間，我們向空氣中排放了大量這類氣體，特別是二氧化碳。（2分，答案不唯一，只要表達(dá)正確、通順，與參考答案意思相近即可）
4．The more we burn，the more carbon dioxide will be added to the air./ the more carbon dioxide will be produced.（2分。答案不唯一，只要表達(dá)正確、通順，與參考答案意思相近即可）
5．We'd better go to school by bike of on foot．（關(guān)于節(jié)約能源）/I can give my old books to the younger students．（關(guān)于反復(fù)利用）
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