造成开口困难的最主要原因是().
参考答案:铁口中间渗漏
Make sentences. 连词成句。
1. old your how is father
2. my smaller is fish Sarah's than
3. does what he do
4. will better you soon feel
5. do how you feel
现在的时间是9时20分,此时钟面上时针与分针夹角的度数是______度.