①将一小块金属钠长期露置于空气中发生一系列变化，最终产物是____ ；②用脱脂棉包住约0.2g过氧化钠粉未，置于石棉网上，往脱脂棉上滴几滴水，可观察到脱脂棉燃烧起来．由实验现象所得出的有关过氧化钠和水反应的结论是：

a：有氧气生成；b____ ．

Na₂O₂和水反应的化学方程式是　____ ．

六年小学生活中，大家都会遇到困难，征服了困难，你便会有成就感、自豪感。请你以“我不怕困难”为题写一篇习作，注意写出自己的真实感受、感想和感情。

要求：①要以记叙为主，内容要具体、真实、生动。②语句要通顺，叙述要有条理。③文中不能出现真实的人名、地名、校名。④字数500字左右。

   Linda is a 15-year –old American girl. She is outgoing and likes making friends. Her parents are very   1 .They have no tome to stay with Linda,  2she spends a lot of time on the Internet(网络) every day. She likes  3    with other people on QQ and her QQ name is Lily.
   Last year, Linda got to know a young man on the Internet.  4 name is Mike. Mike is 18 years old. He lives  5  Toronto, Canada. He is very friendly and 6
   He likes to tell jokes and makes Linda happy. Linda talked with him on QQ for long hours every night. A few days later, Mike posted a 7 of himself(他自己) to Linda. He is 8 and good-looking in the photo. Linda likes him very much and they become good friends.
   Last month, Linda’s parents went to Toronto for a meeting (会议). Linda wanted to visit his friend Mike. She asked her parents to  9her there. When Linda arrived at Mike’s house, she found her 10was only a nine-year-old boy .He wasn’t that tall man in the photo. How surprised Linda was!

如图是由5个相同的小正方体组成的立体图形，这个立体图形的主视图是（   ）

阅读理解

Hi，HanLi，

    got some good news to tell you．One of our old friends，Zhao Yan，is going to visit us at the weekend．Do you remember her?She has a round face and two big eyes．She lives with her parents in Tianjin and is coming to see us．Lisa is her English name．I've got two photos of Zhao Yan. In one photo，she is playing basketball．That' my favourite sport.In the other one,she is drinking pear juice.It is her favourite.

    Let's have a picnic near a lake on Saturday．Of course，we can go boating too．Maybe you'd like to swim in it．Remember to catch the fish when you see them in the water．I'm going to meet Zhao Yan at the airport on Saturday morning．And we can meet near the lake at about eleven o'clock．You may come by bus．Remember to get off the bus at Lake Stop．

Yours，

WuTong

根据材料内容选择最佳答案。