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!
的一个实数根，则该三角形的周长是（ ）