问题
选择题
下图表示枪乌贼离体神经纤维在Na+浓度不同的两种海水中受刺激后的膜电位变化情况。下列描述错误的是
A．曲线a代表正常海水中膜电位的变化
B．两种海水中神经纤维的静息电位相同
C．低Na+海水中神经纤维静息时，膜内Na+浓度低于膜外
D．正常海水中神经纤维静息时，膜内Na+浓度高于膜外
答案
答案：D
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下图表示枪乌贼离体神经纤维在Na+浓度不同的两种海水中受刺激后的膜电位变化情况。下列描述错误的是
A．曲线a代表正常海水中膜电位的变化
B．两种海水中神经纤维的静息电位相同
C．低Na+海水中神经纤维静息时，膜内Na+浓度低于膜外
D．正常海水中神经纤维静息时，膜内Na+浓度高于膜外
答案：D
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| We were going to play against a team from a country school. They didn't come until(直到……才) the game time 1 . They looked worse than we had thought. They were 2 dirty blue jeans and looked like farm boys. We 3 thought that they had never seen a basketball before. We all sat down. We felt that we didn't need any practice 4 a team like that. There was no 5 left for them to do a warm-up. The game began. One of our boys got the ball and he shot a long pass to our forward(前锋). 6 , a boy in a dirty T-shirt stopped the pass and with a beautiful form he shot and got two points. They 7 us. Then they got 8 two points in a minute. Soon it was all over. The country team 9 in the end. We certainly learned that even though(即使) a team is good, it still has some weak points. But the important lesson 10 learned was: One can't tell a man, or a team, by the clothes. | ||||
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