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[主观题]

听力原文:M: Now that you are all here, let me show you around this plant, and if you liste

n closely, you might learn something about glass and crystal.

W: I had nothing about the structure of crystal before I have just learned in our science class. I always thought there was crystal in glass.

M: Well, real crystal is generally a hard substance in which the atoms are arranged in a highly ordered structure much like the framework of a skyscraper.

W: Does that mean in ordinary glass the molecules are not ordered?

M: That's right, but most of the glass made here is actually lead crystal or glass with a high lead content.

W: Lead? Isn' t lead poisonous?

M: What it does is to make a very good quality glass. You will see several samples of glass on the tour. If everyone is ready now, please follow me.

W: I am supposed to hand in a paper in this aspect after the tour.

(20)

A.At an industrial site.

B.In a classroom.

C.At a department store.

D.In a laboratory.

提问人:网友chang00613 发布时间:2022-01-07
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