问题
填空题
用括号内所给单词的适当形式填空。
1. You are ____ (suppose) to keep silent when the teacher is speaking in class.
2. When I was introduced to the American professor, we __ _ (shake) hands with each other.
3. People_______ (drop) by each other's house on the Spring Festival.
4. I feel very _______ (relax) when I listen to my favorite music.
5. They usually make plans __ (see) friends.
答案
1. suppoesd 2. shook 3. drop 4. relaxed 5. to see
（一R—表示某种烷基，X表示非含氧官能团），A在一定条件下还有如下图所表示的反应关系，D能发生银镜反应，G分子中有两个苯环。