These problems are different from each other, so they should be dealt with .
A. totally
B. simply
C. separately
D. extremely
网友回答
A. totally
B. simply
(答案→)C. separately
D. extremely
解析： 考查词义辨析，totally完全地，simply简单地，separately单独地，各自地，extremely极其地，句意：这些问题彼此互不相同，因此我们应该单独地处理。故选C。