英语四级

单选题

A．The shape of the dust particles in the air.
B．The relative humidity.
C．The temperature of the air.
D．The geography of the area.

参考答案：C进入在线模考
What determines the shape of the snowflakes?
【听前预测】
1．四项均为以the开头的名词短语。
2．两项含有air。
3．一项提及湿度(humidity)，一项提及温度(temperature)。
结论：本题可能与影响雪花形成的某些条件有关。
【解析】题干问是什么影响着雪花的形状。女士提到，文章的作者通过广泛的研究发现，雪花晶体的形状在很大程度上是由空气的温度决定的。故选C。对话中还提到了男士和女士的猜测，但他们所提到的都不是真正的影响因素，需注意排除。

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1

A．Inspect snowflakes more carefully.
B．Make a copy of the article.
C．Write down more information.
D．Draw diagrams of the different shapes.

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2

A．To explain a new requirement for graduation.
B．To interest students in a community service project.
C．To discuss the problems of elementary school students.
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3

A．He advises students participating in a special program.
B．He teaches part-time in an elementary school.
C．He observes elementary school students in the classroom.
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