题目

下列化学符号错误的是A．氯化镁：mgcl2B．氦气：HeC．3个亚铁离子：3Fe2+D．2个氮原子：2N 答案：A解析:略根据短文内容及首字母提示，填写所缺单词。“I’m hot and tired.” said Alice. She was sitting beside the river with her sister. It was the summer holidays and Alice had n1. to do. Her sister was three years older than her and seemed too old to play games. “How boring the holidays are!”thought Alice “Read a book,” said her sister.“I don’t like reading,” r2.Alice.“Go for a walk,” suggested her sister.“It’s too hot,” answered Alice.“Go to sleep then,” said her sister a3.. “And let me read my book!”“What’s that? Alice saw something m4. very fast behind a tree. It was a white rabbit with pink eyes.” Wow, imagine a rabbit wearing glasses, “thought Alice.The rabbit was also wearing black and white checked trousers, a yellow shirt and a red jacket. What terrible clothes!”“Where is it going i5. those ridiculous (可笑的) clothes? What has it got?” said Alice She f6. the rabbit along a path.In the wood there were lots of trees. The rabbit stopped at a big oak tree and disappeared! Alice ran after the rabbit. There was a very long tunnel in a hole under the tree. When the tunnel e7., Alice was in a room. There were a lot of mirrors!Alice looked in the first mirror. “Oh, dear. Is that me?” said Alice, “I’m fat I’m huge!”She looked at h8. in the second mirror. “Now I’m thin. Thin and tall.” Then she looked in the third mirror. “Now I’m on my head,” said Alice, laughing. In the fourth mirror her body was l9. a big “S”.When Alice looked for a f10. time in another mirror. She saw a big mouth smiling at her. Then she saw a nose and eyes! It was a cat! But only the head!