题干
—Jack, you seemed _______ at the party.
—You must be kidding. I felt _______ among those successful people.
A：confident; out of
B：nervous; out of shape
C：relaxed; out of place
答案(点此获取答案解析）
C
的正方形的四个顶点上．已知引力常量为G．关于四星系统，下列说法错误的是（忽略星体自转）（ ）
