【单选题】- How _______ he looks! -Yes, he is sitting there_____, not knowing what to do. [ ]
【单选题】气体的流速为亚音速,为使气体的流速继续提高可用_______。
【单选题】( )对保险标的不具有保险利益保险合同无效
【单选题】--Professor Brown looks sad today.--He is sad. Yesterday a fire broke out in his house and his dog got ______.
【单选题】( )对保险标的不具有保险利益保险合同无效