We are glad to hear that the terrorists ________ by the brave policemen several days ago.
A：are caught
B：were caught
C：have been caught
D：are going to be caught
细胞工程的理论基础是细胞的全能性。下列哪种细胞的全能性最高？( )
受到推力的物体应该向着( )的方向移。
