TOEFL Listening: ETS-TOEFL听力机经 - 1KD4773Z3S83998SP$

What does the professor suggest the man include in his paper? A. A comparison of the alchemy practiced in different regions of the world B. A biography of the scientist who first proposed the phlogiston theory C. A discussion of various developments in eighteenth-century European history D. Details about the applications of the phlogiston theory