[originaltext]W: Have you ever looked really closely at the snowflakes? M: Sur

游客2024-02-08  23

问题  
W: Have you ever looked really closely at the snowflakes?
M: Sure, but they usually melt too fast for me to get a close look. Why do you ask?
W:[12][13]I’m just curious. I was reading an article about the formation of snowflakes, and I realized that I had never paid much attention to them before.
M: Well, there is a big variety, isn’t there?
W: Yeah, but they all have one of the three basic forms: hexagonal columns, thin hexagonal plates and the branching star-shaped form.
M: I wonder why the forms are different, maybe because ice starts to form on dust particles with different shapes.
W: Well, I thought it might have something to do with the water saturation of the air. But we’re both wrong.[14] The author of this article did extensive research and concluded that the shape of snow crystals is largely controlled by the temperature of the air. For example, the feathery star-shaped snowflake that everyone thinks is typical occurs only at a specific temperature.
M: Doesn’t the relative humidity have anything to do with the shapes?
W: Apparently not. The effect of super saturation is simply to alter the growth rate. The greater the saturation, the faster the snowflakes form.
M: Wow,[15]next time it snows, I’ll make a point of taking a close look.
12. What are the two persons talking about?
13. Why has the woman brought up the subject of snowflakes?
14. What determines the shape of the snowflakes?
15. What does the man say he’s going to do?

选项 A、Whether or not snowflakes can be analyzed.
B、How snowflakes are formed.
C、What causes a snowstorm.
D、Where the largest snowflakes can be found.

答案 B

解析 题干问对话中的两人正在讨论什么问题,一般情况下,我们在对话开头就可以找到关于话题的线索。女士问男士是否注意观察过雪花,并说她最近读了一篇关于雪花形成的文章。在接下来的对话中,他们谈到了造成雪花形状不同的因素。故选B。
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