单选题

单选题 What is the woman studying?

A、 The basic structure of atoms.
B、 The basic structure of molecules.
C、 The basic structure of neutron.

【正确答案】 B

【答案解析】[听力原文]10-12
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, hut it's much more common than carbon.
M: Oh, I see.

单选题 What does the woman expect to learn from her study?

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.

【正确答案】 A

【答案解析】

单选题 What is the advantage of silicon over carbon?

A、 Silicon is much more uncommon than carbon.
B、 Carbon is much more common than silicon.
C、 Silicon is much more common.

【正确答案】 C

【答案解析】