A：突触包括突触小体、突触间隙、突触后膜
B：神经递质通过主动运输方式由突触前膜进入突触间隙
C：神经递质作用于突触后膜上的受体时，使下一个神经元兴奋
D：神经递质由突触前膜释放到突触间隙，取决于突触前膜的一定的流动性
根据凸透镜成像规律，完成下列问题
I have many favorite hobbies．I like____magazines and books．My parents like dancing．On Sunday in the morning they go to the park to do morning____．In the park they sing and dance but I am reading a____ book．On Sunday afternoon I am going to the bookshop to read____books．It is fun．Sometimes I play table tennis with grandparents．I also like taking____，too．They are interesting．
我国长江中下游地区“鱼米之乡”形成的主要原因是（ ）
