The professor, however, insists that …

　　To bolster his conclusion, he offers three specific points in the lecture, directly challenging the reading passage.

　　For one thing, the professor suggests that … which contradicts the belief in the passage that …

　　To be specific, ….

　　In the second place, even though the reading material asserts that … the professor argues in the lecture that …., pointing out that …

　　Obviously, his argument opposes its counterpart in the material.

　　Moreover, in accordance with the professor, … He supports his point of view with the fact that … This casts doubt on the final argument in the reading that …

　　In general, the speaker clearly disapproves of the view that..... She also presents the evidence successfully against the main idea.