题干

下图是反射弧的局部结构示意图,刺激a点(a点为两接线端之间的中点),检测各位点电位变化。下列说法错误的是(   )

A:若检测到b、d点有电位变化,说明兴奋在同一神经元上是双向传导的

B:兴奋由c传导到e时,发生电信号→化学信号→电信号的转换

C:若c处检测不到电位变化,是由于突触前膜释放的是抑制性递质

D:电表①不偏转,电表可能②偏转两次学

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答案(点此获取答案解析)

A

同类题2

阅读下面信息,请从以下选项(A、B、C、D、E和F)中选出符合31-35题的选项,其中有一项是多余的。

①My friend Jenny always takes a CD player with her and listens to loud music. I think it may hurt her ears. But she doesn't seem to care. ____ 

②Sam saw some bird eggs under a tree when we had a trip in the forest. He wanted to take them home. I stopped him. He's angry with me. ____ 

③Jack let me play with his favorite toy car. I made it go too fast and crashed. ____ 

④All my friends have many new clothes. They wear clothes in different style every day. But my parents can't afford(负担得起) it. I think it's a shame. ____ 

⑤My close friend always wants me to give him the answers in exams. I do that. But I'm afraid I might be caught. If I don't do that, he might not be my friend anymore. ____ 

A. Try to talk to him, and tell him it's wrong for you two to do that. Then try to help him with his lessons in your spare time. If he can't accept it, let it be. Maybe he's not such a good friend.

B. You shouldn't regret(遗憾). The beauty of one's looking or appearance doesn't stand(代表) for everything. You are young and still depend on your parent. The most important thing is to study hard and you are sure to have a good future.

C. Let her know being grown-up isn't so bad. We can have our own idea, do everything in our own ways.

D. I used to have the same problem. You can try my ideas; they really work. First, talk about the things you like best and can do best. Then try to make friends with your neighbors.

E. You can get some examples from newspapers, magazines or TV shows. Let her know it's really bad.

F. Tell him that he has done something bad to animals. If he takes the eggs home, how will their mother feel when she can't find them? On the other hand, what kind of birds are they?

G. Say sorry to him first. And try to repair it. Or you may give him your favorite toy car instead. Or buy a new one for him.