动物疫病诊断时不宜采集（）
A.新鲜病料
B.症状明显病例的病料
C.频死动物的病料
D.经过治疗的动物病料
参考答案：D
用所给单词的适当形式填空.
1. Where _____ Jim _____ (buy) the computer?
2. Beijing is a _____ (center) city of China.
3. The story is _____ (real) interesting?
4. Do they want _____ (go) to the mountains?
5. We _____ (go) _____ (camp) in the mountains last summer vacation.
货币需求也可称为流动性偏好。（）
