A:大食蚁兽、巨嘴鸟
B:斑马、长颈鹿
C:大象、金丝猴
D:鸸鹋、袋鼠
Our teachers do whatever they can for us. They think that's their duty.
活动中,第一小组植树2棵,第二小组是第一小组的4倍,而第三小组又是第二小组的4倍,第三小组植树多少棵?