对临床诊断有困难的急性腹膜炎，最佳的检查是
A．X线钡餐检查B．选择性血管造影C．诊断性腹腔穿刺D．内镜检查E．放射性核素扫描
参考答案：C
按要求改写句子。
1. Did you watch videos yesterday evening? (作肯定回答)
__________________________________________________________.
2. There is an Australian teacher in our school this year. (用last year改写)
3. He did his homework an hour ago. (改为一般疑问句，并作否定回答)
__________________________________________________________?
4. Ellen is going to clean the blackboard. (用often改写)
5. He cleaned the classroom and played football that afternoon. (改为否定句)
《商业银行杠杆率管理办法》规定，商业银行应当在每个会计年度终了后四个月内披露杠杆率信息。因特殊原因不能按时披露的，应当至少提前（）向银监会申请延迟。
A.30个工作日
B.15个工作日
C.20个工作日
D.10个工作日
