题目: 下列天体系统中,无恒星的是()A.地月系B.银河系C.河外星系D.太阳系 答案: 参考答案:A解析:地月系中的天体只有地球,属于行星;月球属于卫星,故没有恒星。考点:本题考查天体系统和天体类型。
题型:选择题 She looks sad. Could you please tell me that prevents her from being as happy as before?[ ]A. what it is B. it is what C. how it is D. it is how 查看答案