邦联是一种( )。
A.国家联盟
B.联盟国家
C.典型的国家形态
D.联盟制的初级阶段
参考答案:A
用所给单词的适当形式填空。
1. Frank ______ (bring) some interesting books to me.
2. Where ______ Lisa ______ (come) from?
3. His uncle ______ (learn) French now.
4. The little boy is very ______ (fun).
5. I ______ (think) how to answer the question.
急性毒性试验一般观察时间是()
A.1小时
B.1天
C.1周
D.2周
E.1月