What is the woman studying?

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问题 What is the woman studying?
  
M: What are you looking for?
W: 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 that?
W: We’re trying to see the kinds of carbon molecules in which we can use silicon as a substitute.
M: What difference would that make?
W: Silicon has a lot of the same properties as carbon, but it’s much more common than carbon.
M: Oh, I see.

选项 A、The kinds of molecules in which carbon may be replaced by silicon.
B、The importance of silicon.
C、The difference between molecules and silicon.

答案A

解析
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