我国自然资源法的基本原则有哪些
参考答案：
The poor little girl was _________young to know ______________ when her parents suddenly died in an accident.
A．so; what to do
B．too; what to do
C．so; how to do
D．too; how to do
维生素D可治疗（）
A.骨软化症
B.脚气病
C.口腔生殖综合征
D.眼干燥症
E.克汀病
