问题
单项选择题
膜电位等于K＋平衡电位时
A．Na＋通道开放，产生净Na＋内向电流
B．Na＋通道开放，产生净Na＋外向电流
C．Na＋通道开放，不产生净Na＋电流
D．K＋通道开放，不产生净K＋电流
E．膜两侧K＋浓度梯度为零
答案
参考答案：D
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膜电位等于K＋平衡电位时
A．Na＋通道开放，产生净Na＋内向电流
B．Na＋通道开放，产生净Na＋外向电流
C．Na＋通道开放，不产生净Na＋电流
D．K＋通道开放，不产生净K＋电流
E．膜两侧K＋浓度梯度为零
参考答案：D
第二节摘录信息 （共5小题；每小题1分，满分5分） 阅读下面短文，根据所读内容在文后第65至第69小题的空格里填上适当的单词或短语，并将答案转写到答题卡上。 注意：每空不超过3个单词。 FOR many young people, Halloween is the best day of the year. The holiday has a very interesting history. It was first celebrated in Ireland and Scotland as a festival of the dead. Families invited their ancestors (祖先) into their homes but tried to keep bad spirits (精灵) out by wearing scary costumes (服装). Now the holiday is a time for fun and excitement. Families carve (雕刻) scary or funny faces into pumpkins and put candles inside to make them into lanterns (灯笼). These are called jack-o''-lanterns. Children dress up in costumes and walk around their neighborhoods collecting candy. They knock on doors and when a person opens the door, the children shout, “Trick or treat!” Once, this meant that if the person at the door did not give the children a treat, they would play a mean (坏的) trick. But today, children usually do not play tricks. They are too busy getting as much candy as they can!
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