房地产价格评估机构资格等级每2年审验一次，合格的原资格等级可再延期2年。( )
参考答案：对
Only when he failed in the final exam ____up his mind to study harder to catch up with the classmates ahead of him.
A．he made
B．he had made
C．had he made
D．did he make
蛛网膜下腔阻滞麻醉的绝对禁忌证是（）
A.老年人和儿童
B.高血压
C.孕妇
D.有哮喘病患者
E.脊髓有病变者
