浓硫酸易侵蚀玻璃而影响纯度，应保存在塑料瓶或者涂石蜡的玻璃瓶中。
参考答案：错
小医生，下列各句均有一处错误，请找出并改正。
1.Help yourself to some chicken,children.
______________
2.He is very young,and he knows a lot.
_____________
3.His mother teach him at home when he was young.
4.Because he is too young,so he can't lift the box.
5.The children enjoyed them in the park.
动、植物体具有不同的结构层次．人体组成的结构层次是（ ）
A．细胞→组织→系统→器官→个体
B．细胞→组织→器官→个体
C．组织→细胞→器官→个体
D．细胞→组织→器官→系统→个体
