--What do you think of Lady Gaga? --Maybe she is one of ________ singers in the world.
A:popular
B:more popular
C:most popular
D:the most popular
关于东北三省农业的叙述,正确的是( )
____ ____ ____ = ____(条)
对人体的各种运动,起着控制和协调作用的系统是( )