更正登记是指因土地权利人发生改变，或者因土地权利人姓名或者名称、地址和土地用途等内容发生变更而进行的登记。
参考答案：错
---How long did it _____ you to work out the difficult maths problems?
---I ______ about half an hour on it .
A．take ; took
B．spend ; took
C．spend ; cost
D．take ; spent
最早采用年号纪年的皇帝是 __________。
