①所含的分子数目之比为1：1  

②所含的O原子数目之比为1：2         

③所含的原子总数目之比为2：3  

④所含的C原子数目之比为1：1   

⑤所含的电子数目之比为7：11．

根据短文理解选择正确答案。

      A long time ago, the monkey and the turtle were good friends. One day, they saw a fallen banana tree and decided to plant it. They divided the tree into two parts. The monkey took the part with leaves, thinking that it would grow faster, then they went home and planted it. Many days passed, the monkeys plant died but the turtle's grew well and produced fruit. When the fruit was ripe(成熟的) the turtle asked the monkey to share it with him. The monkey climbed up the tree and ate all the fruit. So the turtle got angry. He found some sharp sticks and put them around the tree. When the monkey came down, he hurt himself. The turtle laughed and hid himself under a big shell (贝壳). The monkey got very angry and caught the turtle.

  “I'll cut you into pieces,” said the monkey.

  “Good, so there will be many turtles.”

  “No, I'll put you into the fire.”

  “That's better, my skin will be red.”

  “No, I'll throw you into the river.”

  “No,” said the turtle, “I'll die.”

    The monkey threw the turtle into the river, and the turtle swam happily.

A

    TheSoundofMusic is one of the most popular American movies. And the song DoReMi in the movie is also popular in the world.

The movie tells a story about a tutor, Maria. She is a young and outgoing woman. She goes to look after a family with seven children. Their family name is Von Trapp. Mr. Von Trapp is a captain. He and his family live in Austria.

    The family are very sad after the children's mother, Mrs. Von Trapp, died. Nobody takes care of the children. They cry and shout every day. The lonely father often becomes angry because of the noisy children.

    Maria often teaches them to sing lively songs and perform short, funny plays. At first the father is almost mad, but the children's smiling faces make him happy again. Then Mr. Von Trapp falls in love with Maria. At last they get married.

血液是人体内的液体组织，其中血浆的主要功能是（　　）

①运输养料和废物  ②促进止血、加速凝血  ③运输氧气和部分二氧化碳  ④运载血细胞．