We had a school English speech last week and the winner was a _______ girl from Class 2, Grade 9.
A:12-year-old
B:13-year old
C:12-years-old
D:13 years old
下列为某两个物体的投影,其中是在太阳光下形成投影的是( )
参与1787年美国宪法制定的汉密尔顿说:“美国的繁荣取决于自己的联合。”此处的“联合”是指