读图，回答问题：

今天是周日，也是张伟的生日。瞧，他请来了他们班一多半同学，在本城最有名气的饭店为他“庆生”。看着春风满面的张伟，刘小玲羡慕地说：“我要是有这么多的朋友该多好啊！”江东东说：“难怪张伟有这么多朋友呢，原来他经常请同学吃饭聚会啊！”文宾疑惑地问：“难道花钱才能获得和维持友谊吗？”

   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!

欲将蛋白质从水中析出而又不改变它的性质，应加入

宇宙空间的年龄通常以光年作单位，1光年是光在一年内通过的距离，如果光的速度为每秒3×10⁷千米，一年约为3.2×10⁷秒，那么1光年约为多少千米？