头环
参考答案：
硬骨鱼类中，左右背主动脉和颈动脉联合成环状结构，称为头环。
下列词语中有四个错别字，划出来并在横线上改正。
亭亭玉立 郑重启事 光芒四射 枝叶扶疏
不堪设想 哑然失笑 漫天飞舞 光明雷落
感人肺腑 万籁具寂 如醉如痴 局促不安
残缺不全 乱七八槽 倾盆大雨 汹涌澎湃
句型转换。
1. She does her homework at home. (对划线部分提问)
_____ _____ she _____ her homework.
2. They speak French. (改为一般疑问句)
_____ they _____ French?
3. Where is Sam from? (改为同义句)
Where _____ Sam _____ _____?
4. The child doesn't have lunch at home. (改为主语为复数意义的句子)
The _____ _____ have lunch at home.
5. Tom likes bananas. (改为否定句)
Tom _____ _____ bananas.
