请仔细阅读下面的材料，分析并回答问题：

据新华社消息，我国自行建立的第一个生物再生生命保障地基有人综合密闭实验系统﹣﹣“月宫一号”完成实验任务，三位实验人员经过105天的科学实验于2014年5月20日成功出舱．“月宫一号”由1个综合舱和2个植物舱组成，总面积160平方米，总体积500立方米．“月宫一号”是能与地球媲美的“微型生物圈”，可实现航天员在远离地球的太空长期生活的目标．

（1）“月宫一号”之所以可称为“微型生物圈”，是因为它具备了构成生物圈的基本要素，即它包含了____、水圈和岩石圈．

（2）“月宫一号”作为一个生态系统，是由生物成分和____组成．从生态系统的组成成分来分析，生活在“月宫一号”内的三位实验人员属于该生态系统的____ （生产者、消费者、分解者）．

（3）“月宫一号”内实验人员的生存不仅需要营养物质，还必须保障生活环境（如空气中氧气含量）的相对稳定性．“月宫一号”总体积500立方米，实验人员仅生活了105天，说明这个生态系统的自动调节能力是____  的．同时，“月宫一号”实验还说明____ 仍是人类和其他生物赖以生存的唯一家园．

说说课文《火把节》主要讲了为什么？

—Excuse me, how long can I keep the book?

—You can return it by the end of this month.

    Many people are surprised when they find that the Internet was set up in the 1960s. At that time， computers were large and expensive. Computer networks didn't work well. If one computer in the network broke down， then the whole network stopped. So a few network system had to be set up. It should be good enough to be used by many different computers. If part of the network was not working， information could be sent through another part. In this way computer network system would keep on working all the time.

    At first the Internet was only used by the government， but in the early 1970s， universities， hospitals and banks were allowed to use it， too. However， computers were still very expensive and the Internet was difficult to use. By the start of 1990s， computers became cheaper and easier to use. Scientists had also developed software that made "surfing" the Internet easier.

    Today it is easy to get online and it is said that millions of people use the Internet every day. Sending e-mails is more and more popular among young people. The Internet has now become one of the most important parts of people's life.