鼻旁窦有哪几对各开口于何处?
参考答案:
鼻旁窦有上颌窦、额窦、筛窦和蝶窦四对。其中上领窦、额窦、筛窦前群和中群开口于中鼻道,筛窦后群开口于上鼻道;蝶窦开口于蝶筛隐窝。
— Don’t be too ______ with what you wear as a middle school student.
— Come on, Mom, stop being _____ on me all the time.
A.controversial, strict
B.particular, hard
C.considerate; keen
D.flexible; offensive
按照公共选择理论,行政官员的“理性经济人”动机会引起( )。
A.政府机构膨胀 B.选举费用日益上涨C.政府机构精简 D.经济产生周期危机