题目

下图是突触的(部分)结构模式图，下列说法正确的是A. 神经递质的释放需要消耗能量，属于主动运输B. 神经递质进入突触后膜后，引起突触后膜的兴奋或抑制C. 神经元轴突末梢多次分支，每个小枝末端膨大，形成突触小体D. ①表示一个神经元的轴突末梢膜，②表示另一个神经元的树突膜或细胞体膜 答案：【答案】C【解析】突触小泡内的神经递质释放的方式是胞吐，需要消耗能量，A错误；神经递质与突触后膜上的受体结合后，引起突触后膜的兴奋或抑制，神经递质不进入细胞内，B错误；神经元轴突末梢多次分支，每个小枝末端膨大，形成突触小体，C正确；②表示一个神经元的轴突末梢膜，①表示另一根据对话内容选出可以填入空白处的最佳选项，有两项为多余选项。A:1.B: Tom Sawyer, by the famous American writer, Mark Twain. I’m writing about him for English class.A: I read Tom Sawyer. Very good！Hey, we can find out about him on the Internet.B: Yes! …OK.2. His real name was Samuel Clemens and he was born in 1835 in Missouri He left school and began work at the age of twelve.A:3.B: He wrote for a newspaper. Later he got work on a boat.A:4.B: No, he went to New York, and other cities.A:5.B: I don’t know the exact date. But he took the name Mark Twain and became very famous in the 1860s. He went to Europe as well. But he didn't come to China.A: Yes, I knew that. Enjoy the book.B: Yes, it’s good.A.Look at this!B.When did he begin his stories?C.That’s OK.D.What are you reading?E.Why don’t we go for a swim?F.Did he stay in Missouri?G.What did he do?