下为突触的亚显微结构图。
④⑤⑥合称突触，④为（），⑤为（）。
参考答案：突触前膜；突触间隙
解析：突触包括突触前膜、突触间隙和突触后膜。
根据句意及首字母补全在本课中出现的单词。
1. E_____ in our class can help each other.
2. In the early morning,the air is very f_____ .
3. It's a h_____ store,We can't move it.
4. We should o_____ a club to collect the paper.
5. Please b_____ your stamp collection to school.
训练课的结构
