She sat in her seat, her hands gripping its arms, her seat belt already fastened. The air hostess was talking, telling everyone what to do in case of emergency, showing them where their .life-jackets were. The plane was crowded, every seat was full. From her window seat, getting out in a hurry would be impossible, thought Ann. In any case who would want to get out of a plane in mid-air?
The engines began to shake--the noise increased till it was like a great rushing wind. She looked out to see the runway slip past at astonishing speed. She wanted to cry out--to stop the plane before it left the ground, but she knew she was trapped in this great roaring machine. I must scream, she told herself, and put her hands over her eyes.
There was a strange feeling as if she were going up in a lift. The noise died down. Carefully she opened her eyes. Through the window she saw a great carpet of cloud above, so beautiful that she stared in wonder, hardly turning away from the window till they touched down.
Ann thought she would be frightened because ______.
A.she had never flown before
B.she had a fear of being in high places
C.she hadn' t made proper preparations.
D.she was naturally timid
第1题
丙戊酸抗癫痫作用的机制是
A、抑制电压敏感性钠通道
B、稳定膜电位,阻止癫痫病灶异常放电的扩散
C、抑制癫痫病灶向周围高频放电
D、抑制电压敏感性钾通道
E、以上均不是
第2题
大仑丁抗癫痫作用的机制
A.抑制癫痫病灶向周围高频放电
B.稳定膜电位,阻止癫痫病灶异常放电的扩散
C.加速Na+、Ca2+内流
D.高浓度激活神经末梢对GABA的摄取
E.以上均不是
第3题
苯妥英钠(大仑丁)抗癫癎作用的机制是
A.抑制癫痫病灶向周围高频放电
B.稳定膜电位,阻止癫痫病灶异常放电的扩散
C.加速Na+、Ca2+内流
D.高浓度激活神经末梢对GABA的摄取
E.以上均不是
第6题
苯妥英钠抗癫痫作用主要原理是
A.直接抑制病灶本身异常高频放电
B.稳定神经细胞膜
C.抑制脊髓神经元
D.具有中枢性肌肉松驰作用
E.对中枢神经系统普遍抑制
第7题
A.苯二氮䓬受体激动剂,可加强突触前抑制,抑制皮质、丘脑和边缘系统的病灶异常放电向周围脑组织的扩散
B.增强γ-氨基丁酸A型受体活性,抑制谷氨酸兴奋性
C.阻滞电压依赖性的钠通道,抑制突触后神经元高频动作电位的发放
D.GABA氨基转移酶抑制剂
E.减少Na+内流而使神经细胞膜稳定,限制Na+通道介导的发作性放电的扩散
第8题
A、抑制癫癎病灶向周围高频放电
B、稳定膜电位,阻止癫癎病灶异常放电的扩散
C、加速Na+、Ca2+内流
D、高浓度激活神经末梢对GABA的摄取
E、以上均不是
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!