第2题: [单项选择]We are not conscious of the extent of which work provides the psychological satisfaction that can make the difference between a full and empty life.
A. to which B. in which C. at which D. by which 参考答案:A 答案解析:[解析] 本题考查固定短语的用法。在句子中,which引导定语从句,to the extent of“到……的地步(或程度)”为固定用法,所以此处应选用介词to。所以,答案是A。
第15题: [单项选择]下列窦腔开口位置正确的是 A. 额窦开口于下鼻道 B. 额窦和上颌窦开口于中鼻道 C. 筛窦和蝶窦开口于中鼻道 D. 额窦开口于上鼻道 E. 额窦和蝶窦开口于上鼻道 参考答案:B 答案解析:上颌窦、额窦、筛窦的前群与中群均开口于中鼻道;筛窦后群开口于上鼻道,蝶窦开口于上鼻甲后上方的蝶筛隐窝。