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!

修改病句

①我们要经常锻炼身体，增加体质。

②这本书符合小朋友阅读。

③看了这本书，使我深受教育。

④他估计生病的小芳明天肯定不会来了。

⑤我比他的年龄差不多。

⑥汽车在公路上迅速地飞奔。

从人类社会发展的纵向来看，生态文明将成为继农业文明、工业文明之后的第三种文明；从社会现实存在的横向来看，生态文明是和物质文明、精神文明、政治文明并列的一种文明形式。生态文明的提出和实施，是人类对长期以来发展模式反思的结果，是人类发展观的一次飞跃，是人类文明理念的一次创新。这表明
①联系是事物存在和发展的条件   ②人们可以根据需要进行创新 
③创新是继承与发展的统一       ④理念创新源于人们的深刻反思

若函数为纯虚数，则的值为（  ）

解方程。