(2013·北京东城一模,17题) “探路者”号宇宙飞船在宇宙深处飞行的过程中,发现A、B两颗均匀球形天体,两天体各有一颗靠近其表面飞行的卫星,测得两颗卫星的周期相等,以下判断正确的是 A. 两颗卫星的线速度一定相等 B. 天体A、B的质量一定不相等 C. 天体A 、B的密度一定相等 D. 天体A 、B表面的重力加速度一定不相等24、I feel it is you as well as your wife that ______ for
your son’s bad performance at school.
A.
are to
blame
B. is going to be blamed
C.
are to be
blamed
D. is to blame