The whole text consists of 25 paragraphs. The following sentences are the main ideas of each paragraph. Please match each of the following main ideas with the appropriate paragraph number of the text. ______ A good knowledge of the greenhouse effect should be a better understanding of its three components. ______ Change in the understanding of greenhouse effect before and after the experiment is measured by some tests. ______ The results show the improvement of students' understanding of greenhouse effect and global warming. ______ Necessary methods are used for the reliability of data analysis. ______ Knowledge integration rubrics are used to analyze the responders' answers.