The article states that ... and provides three reasons of support. However, the professor explains that ... and refutes each of author's reasons.

First, the reading claims that ... The professor refutes this point by saying that ... He states that...

Second, the article posits that ... However, the professor says that ... According to the professor...

Third, the reading says that ... The professor opposes this point by explaining that ... We also learn that...

The article states that ... and provides three reasons of support. However, the professor explains that ... and refutes each of author's reasons.