How to retrieve odd rows from the table?

In the Base table always Cr\_id is duplicated 2 times.
[Base table](https://i.stack.imgur.com/gDnLE.png)

I want a SELECT statement that retrieves only those c\_id =1 where Cr\_id is always first as shown in the output table.
[Output table](https://i.stack.imgur.com/4HQu0.png)

Just see the base table and output table you should automatically know what I want, Thanx.