A:are corrected; will
B:are being correcting; should
C:are being corrected; shall
D:are being corrected; would
蒙古利亚人种、欧罗巴人种、尼格罗人种分别对应于( )
青蛙的生殖和发育可以摆脱对水环境的依赖。
我国最大的城市群位于( )