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2、1969年7月，美国的“阿波罗11号”载人飞船成功地在月球上着陆。Online Learning
With the development of society, it is unstoppable that more and more school will make students have access to online learning.
8、对生活垃圾进行分类和分装，这是我们每个公民应尽的义务。
15、在显微镜下，我们看到了叶细胞中的叶绿体，还看到了叶表皮上的气孔。1、月相的变化有什么规律？（P49）Bat what makes it so popula
2、r? As far as I am concerned, the reasons are as follows. First of all, it is the most money-saving way of learning because the learners can learn whatever they want at the minimum cost. What's more, for people who are easily shy, it is a perfect method because they don't have to speak in public. Wha
3、t they need to do is communicating with people use-able via typing. Last but not least, as long as we have a computer connected to the internet, learners can have the courses anywhere at any time. So it is more convenient for learners.
第三单元 宇 宙However, every coin has two sides, even online le
4、arning with good prestige can not be perfect. If the learners of online learning can not control themselves well, they will not benefit from online learning. On contrary, the Internet can be the tool to play more addicting computer games.
二、问答：
23、我国是世界上公认的火箭的发源地，早在距今1700多年前的三国时代的古籍上就出现了“火箭”的名称。5、减少垃圾的数量是从源头上解决问题的办法，我们每个人都可以想出许多减少垃圾数量的方法。So, we should have a correct awareness of online learning and make good use of it, so that it can benefit us instead of keeping us from improvement.
第二单元 物质的变化
一、填空：
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