M: What are you looking forW: We’re studying the basic structure of molecules.M: Just any molecules There are quite a few of them!W: Yes, far too many. We’re only working with certain molecules that contain carbon and hydrogen.M: What do you expect to learn from thatW: We’re trying to see the kinds of carbon molecules in which we can use silicon as a substitute.M: What difference would that makeW: Silicon has a lot of the same properties as carbon, hut it’s much more common than carbon.M: Oh, I see. What is the woman studying().
A. The basic structure of atoms.
B. The basic structure of molecules.
C. The basic structure of neutron.