Question 2: 
Find out words that form a super/subordinate relationship with the given words.
Example: company -- Mercedes Benz (Mercedes Bens is the subordinate word of the word "company")
1. Activity:                  ,                     
2. competitive advantage:                   
A、purchasing a high-end product, providing outstanding after-sales services, cost advantage
B、differentiation strategy, analyzing the value chain, outsourcing
C、differentiation strategy, purchasing a high-end product, cost advantage
D、focus on one activity, differentiation strategy, outsourcing