已知数列{an}满足：a1=3，且an+1=2an-1（n∈N*）．（1）求证数

阅读填词，根据短文内容，补全所缺单词，每空一词。

                                                          Peter and the Wolf

       This is a story about a brave boy. His name was Peter. Peter and his grandfather lived in a house

next to the woods. In the summer, Peter liked to play outside with the animals. They were his friends.

       In the winter, Peter didn’t play outside. His grandfather was worried. A wolf lived in the woods.

Grandfather said, “The wolf can’t find food in the winter. A hungry wolf can eat a boy!”

       One cold day, Peter wanted to go outside. He wanted to find the wolf. “I’m stronger than a

wolf, ”he said. “I’m going to catch the wolf.”

       Peter went outside. He walked in the woods. He heard a sound! “The wolf!” he shouted.

       “No,” said Sasha the Bird. “I’m not the wolf. I am your friend.”

       Peter wasn’t afraid now. He and Sasha walked in the woods. They heard a sound! “The wolf!”

they shouted.

       “No,” said Ivan the Cat. “I’m not the wolf. I’m your friend.”

       Peter and Sasha weren’t afraid now. The friends walked in the woods. They heard a sound!

“The wolf!” they shouted.

       “No,” said Sonia the Duck. “I’m not the wolf. I’m your friend.”

       Peter, Sasha, Ivan, and Sonia walked in the woods. They heard a sound. “The wolf!” they

shouted.

       A big wolf jumped in front of the friends. “I’m the wolf!” it said, “I’m bigger than a bird.

I’m wilder than a duck. I’m scarier than a cat. I’m stronger than a boy. And I’m very, very,

hungry!”

       The wolf jumped! Sasha the Bird flew into a tree. Ivan the Cat climbed the tree. Peter ran behind

the tree. Peter threw a rope around the wolf. “Sonia,” he shouted. “Where are you?” Did the

wolf eat Sonia?

       Then Sonia flew to Peter. “Here I am,” she said. “I was faster than the wolf.”

       Peter was happy. He caught the wolf, and his friends were safe.

      Good afternoon! My Chinese   1   is Jia Jia. My   2   name is Lily. I am a student（学生） of a

middle school in Beijing. I am in   3   One,   4   One.  5   Gao is my English teacher. I like her. Welcome

to Beijing!

被称为“芝加哥公约”的是以下哪个公约?

A.《反劫机国际公约》

B.《国际民用航空公约》

C.《统一国际航空运输某些规则的公约》

D.《国际航空运输协定》

血虚病证多见于（）

A.肝脾

B.心肝

C.脾肺

D.肺肾

E.肝肾

如果作用在气块上的重力与静压力保持严格的平衡，气块的垂直加速度为零，则这种大气平衡状态称为流体静力平衡，简称（）。

政府采购法律制度就是指《中华人民共和国政府采购法》。