问题
单项选择题
突触后抑制时，下列哪种情况不会出现
A．突触前膜释放神经递质
B．突触后膜C1-内流
C．突触后膜超极
D．兴奋性突触后电位
E．突触后膜的兴奋性降低
答案
参考答案：D
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突触后抑制时，下列哪种情况不会出现
A．突触前膜释放神经递质
B．突触后膜C1-内流
C．突触后膜超极
D．兴奋性突触后电位
E．突触后膜的兴奋性降低
参考答案：D
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| A concert violinist was performing a difficult piece in front of a large audience. Suddenly there was a loud snap(断裂声), and the _1 could be heard throughout the auditorium (礼堂). The audience _2 knew that a string(弦) had broken. They all _3 the concert to stop for a short time _4 another instrument was brought to the musician. But instead, the _5 calmed herself down and then signaled the conductor to start again. The orchestra continued where they had _6 and the musician played the music on three strings. In her mind she _7 new fingering to make up for the missing string. A work that few people could play _8 on four strings, the violinist played on three. When she _9 and bowed(鞠躬) to the audience, there was a silence in the hall. And then the crowd rose to their feet and cheered wildly. The violinist 10 and wiped sweat from her forehead. When 11 returned to the hall, she explained 12 she had continued to play although there was a 13 string. "You know," she said, "sometimes it is the artist's 14 to find out how much music they can still 15 with what has been left." Maybe we've _16 most of our lives and we have only a little time left. Maybe disease has robbed(夺走) us of our capacity to work. Or perhaps a financial loss has left us very 17 . Can we still make "music"? There will come a time when we all 18 loss. Can we find the courage to discover how much "music" we can still make with what has been left, just like the violinist? And if it takes extra courage to make the "music", others will applaud (拍手称赞)your _19_. Some people have lost more than others, 20 they are brave enough to face it. They inspire the rest of us to reach greater heights. | ||||
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