花瓣和花冠、花萼和萼片的关系？
参考答案：花冠是花瓣的总称，花萼是所有花片的总称。
用所给词的适当形式填空。
1. The girl likes wearing _____ (color) clothes.
2. I told them _____ (wait) for me outside the school gate.
3. The house is old, and _____ (build)in 1980.
4. What about _____ (get)a part-time job?
5. I think I _____ (lose) my new jacket on my way home this afternoon.
从资源空间分类看，国家资源安全属于（）资源安全。
A.全球性
B.地方性
C.区域性
D.内生性
