下列现象中的物体属于生物的是( )
A:机器人弹钢琴
B:火山爆发时岩浆喷出
C:钟乳石在慢慢长大
D:馒头上长出“白毛”
Our teachers do whatever they can for us. They think that's their duty.
关于人类对海洋的科学探索,下列说法正确的是( )