When a given op-amp has a common-mode input of 10 V， the output of the device is 10 V.；When the device has a differential input of 2 mV， the output of the device is 10 V.What is the CMPR of the device？（）

When a given op-amp has a common-mode input of 10 V， the output of the device is 10 V.；When the device has a differential input of 2 mV， the output of the device is 10 V.What is the CMPR of the device？（）
A.5 ：1
B.5000 ：1
C.1000 ：1
D.5，000，000 ：1
正确答案：5000 ：1