牵引搬运具有一定的安全性，如地面障碍、地锚、铁滚等不会出问题。
参考答案：错
被动物学家称为动物界“活化石”的是（）
A、老虎
B、袋鼠
C、大熊猫
D、恐龙
Mum asked Lucy ________.[ ]
A. if could she get some tea for her
B. whether she get some tea for her
C. if she could get some tea for her
D. whether she can get some tea for her
