出卷网(Chujuan.Net)为中小学教师出题组卷参考：月考试卷、模拟试卷、期中期末试卷

During the 【小题1】 (twenty) century , the temperature of the earth 【小题2】 (rise) about one degree Fahrenheit. It is a rapid increase when compared【小题3】 other natural changes .

There is no doubt【小题4】the earth is becoming warmer. Scientists believe 【小题5】 is human activity that has caused this global warming. The increase in the earth's temperature is due to the【小题6】 (burn) of fossil fuels. Some byproducts of this process 【小题7】 (call) “greenhouse” gases, the most important one of【小题8】is carbon dioxide. Without the “greenhouse effect”, the earth would be thirty-three degree Celsius【小题9】 (cool) than it is. So, we need those gases. The problem begins when we add huge quantities of extra carbon dioxide into the atmosphere, causing the global temperature 【小题10】 (go) up.