The reading passage explores the issue of xxxx. The professor's lecture deals with the same topic but in a different tune. He/she claims that xxx, which contradicts what the reading states. And in the lecture, he/she uses three specific points to support his/her idea.
First of all, even though the reading passage suggests that xxx, the professor still challenges in the lecture that xxx. This is because xxx, which means xxx.
Moreover, contrary to the statement in the reading passage that xxx, the professor contends that xxx. Then he/she supports this idea with the fact that xxx, in other words, xxx.
As for the third aspect, the reading hold the view that xxx, whereas the author of the reading argue that xxx. The professor proves that this argument is indefensible by pointing out that xxx, --i.e., xxx.
In conclusion, the professor clearly identities the weaknesses of three aspects mentioned in the reading passage about xxx and convincingly show that xxx.