第13题: [单项选择]Air is composed of ______ gas including hydrogen, oxygen and carbon dioxide. A. varied B. variant C. variable D. various 参考答案:D 答案解析:[精解] 题型:语法题。本题的大意是空气是由氢气、氧气和二氧化碳等各种各样的气体组成的。题意为:空气由不同气体混合组成。varied:consisting of or including many d
第23题: [单项选择]Where would you find a January 1996 issue of Time Magazine A. Level 1. B. Level 2. C. Level 3. D. Level 4. 参考答案:C 答案解析:[分析] 参看原文:Our science and engineering sections can be found on level three.You can also find back is
第30题: [单项选择]枕骨大孔疝初期瞳孔改变常表现为先对称性缩小,继而散大,对光反射迟钝至消失,其可能性最大的机制是() A. 颅内压增高致大脑后动脉压迫动眼神经,使动眼神经内副交感神经纤维受刺激所致 B. 动眼神经内运动神经纤维对损伤敏感,易受颅内高压影响而出现麻痹 C. 若枕骨大孔疝系脑外伤所致,则瞳孔改变需考虑是否同时存在原发性动眼神经受损 D. 急性脑缺氧损害动眼神经核 E. 颅疝使脑干移位过程中动眼神经常可在小脑幕切迹缘、斜坡嵴等坚硬结缔组织处受压而损害 参考答案:D