第25题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. He has bad study habits. B. He sleeps too much. C. He wakes up early. D. He’s an excellent student. 参考答案:A 答案解析:[听力原文]
M:Man,I’m exhausted,I stayed up the whole night studying for my history midterm exam.
W:Why
第26题: [单项选择]下列哪项不是神经-肌接头兴奋传递特点() A. 1:1传递 B. 单向传递 C. 时间延搁 D. 对内环境变化和药物敏感 E. 不易疲劳 参考答案:E 答案解析:神经肌肉接头兴奋的传递通过神经末梢去极化→钙离子内流→含Ach的囊泡向接头前膜移动、融合、破裂→释放Ach→Ach与终板膜上的N型胆碱能受体相结合→受体蛋白质分子内部发生结构变化形成孔道→离子流动终板