Question

【题目】七选五

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Snow is a subject of great interest to weather experts. 1 One reason is that heavy amounts of snow fall in surprisingly small areas. Another reason is that a small change in temperature can mean the difference between snow and rain.

Just what is snow, anyway? Snow is a form of frozen water. 2 These crystals grow from water droplets in cold clouds. They usually grow around dust particles(颗粒). All snow crystals have six sides, but they grow in different shapes. The shape depends mainly on the temperature and water levels in the air.

3 About two and one-half centimeters of rain has as much water as 15 centimeters of wet snow. About 76 centimeters of dry snow equals the water in two and one-half centimeters of rain.

Snowfall helps to protect plants and some wild animals from winter weather. Fresh snow is made largely of air trapped among the snow crystals. 4

Snow can also influence the movement of sound waves. When there is fresh, soft snow on the ground, the surface of the snow absorbs, or takes in, sound waves. 5 Then, the snow’s surface will help to send back sound waves. Under these conditions, sounds may seem clearer and may travel farther.

A. Snow contains much less water than rain.

B. Much of the water the world uses comes from snow.

C. It contains groups of ice particles called snow crystals.

D. It is difficult to predict where, when or how much snow will fall.

E. Because theair has trouble moving, the movement of heat is limited.

F. Under some conditions, these particles may grow larger and form solid pieces of ice.

G. However, snow can become hard and flat as it grows older or if there have been strong winds.

Answer 1

【答案】

【1】D

【2】C

【3】A

【4】E

【5】G

【解析】

【语篇解读】下雪对气象专家来说是一个感兴趣的话题。雪究竟是怎么形成的，雪有什么作用和影响，本文对此进行了阐述。

【1】 后面两句说＂其中一个原因是大量的雪会意外地下在一些地方，另外一个原因是温度的微小改变将意味着下雪和下雨的不同＂，所以在何时何地将下多少雪是很难预测的。故选D。

【2】后面一句＂These crystals grow from water droplets in cold clouds.＂是说＂这些冰晶会因冷云中的水滴而变大＂，所以此处这一句应该是说＂什么是冰晶＂。故选C。

【3】 后面的句子是说＂约2.5厘米的雨和15厘米的湿雪的含水量相同，约67厘米的干雪和1.5厘米的雨水的含水量相同＂，所以得出＂雪比雨含的更少水分＂。故选A。

【4】前面一句＂Fresh snow is made largely of air trapped among the snow crystals.＂说新的雪是由被困在空中的雪冰晶形成的，所以此处要解释原因。故选E。

【5】本段中心是雪也会影响到声波的运动。前后分别讲了＂新鲜的雪＂和＂雪将变得非常硬和平＂对声波的不同影响，前后是转折关系。故选G。