J.K Rowling is the writer of the Harry Potter series, the most popular books.

    J.K. Rowling was born in Bristol in 1965. She has one sister 1 is two years younger than her. Both girls loved listening to bedtime 2 . They loved stories about the magical (有魔力的) world. Rowling 3her first story, called rabbit at the age of six.

    4 she graduated from the university, Rowling worked in London. During that time, on a long train trip in the summer of 1990, the idea of a 5 who has magic but doesn't know it himself came to6 . In 1992, Rowling began to teach English. She lived with her daughter, Jessica, and7much time finishing the first Harry Potter book for young8. It came out in 1997. To her 9 , the book was very successful. The film came out in 2001. Now the Harry Potter series is 10with people of all ages.

    Why is the series so successful? Many other magic stories11place in faraway lands in the past or future times,12Harry lives in modern England. He 's also a very normal boy. When other 13 read the story about Harry, they can 14 being like him.

    J.K. Rowling is very happy with her success. She says she will go on 15 children's books.

拼一拼，写一写。

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（Ⅰ）求角C的值；

（Ⅱ）若c=2，且△ABC为锐角三角形，求a+b的取值范围．

已知复数z=1﹣2i（i为虚数单位）

（Ⅰ）把复数z的共轭复数记作$\stackrel{-}{z}$，若$\stackrel{-}{z}$•z₁=4+3i，求复数z₁；

（Ⅱ）已知z是关于x的方程2x²+px+q=0的一个根，求实数p，q的值．