实验用狗静脉麻醉时首选的部位是（）
A.双侧前肢头静脉
B.双侧后肢小隐静脉
C.舌下静脉
D.足背静脉
E.股静脉
参考答案：A
根据句意和汉语提示完成句子。
1. What's wrong with Jim? He has an a_______ and hurts his leg.
2. What should we do before we c_______ the road?
We should stop and look both ways.
3. Students shouldn't be l_______ for school.
4. You must be c_______ when you want to go across the bridge.
5. If you drive too fast, you'll get a t_______ for speeding.
《房地产开发企业资质管理规定》将房地产开发企业划分为4个资质等级，其中三级资质规定从事房地产开发经营( )年以上。
A．5B．4C．3D．2
