3a+4b=7ab [ ]
错误
下图表示两个神经元相连接的部位——突触。回答下列问题:
(1)突触是由[②]_______、[③]_______和[④]_______三部分构成。
(2)图中[①]为_______,其内部所含的物质为_______。该物质作用于结构④后,引起B细胞的兴奋或抑制。
Dad, you should tell Tom _____ with his friends. [ ]
A. don't argue
B. don't to argue
C. not argue
D. not to argue