综合写作
下红雨:1. 火山爆发的物质 -> 火山爆发的物质应该有酸性,但是检测下下来的雨没有酸性,跟普通雨水一样; 2. meteor explosion->如果是meteor explosion会有大片的云,会覆盖很多地区,不会仅仅只有K市受影响,而且应该会很快结束,不会持续两个月;3. 来自spores of lichens->如果是的话,应该在ground level发现很多spores和lichens,但是地面没有发现,所以更不太可能会travel into atmoshpere去
独立写作
Do you agree or disagree with the following statement? The best way to increase students' interest in a subject is to teach them the significance of the subject outside the school.