Question

【题目】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. Much of the water the world uses comes from snow .

B. It contains groups of ice /span>particles called snow crystals .

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

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

E. Snow contains much less water than rain .

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

G. Because the air has trouble moving , the movement of heat is limited .

Answer 1

【答案】

【1】C

【2】B

【3】E

【4】G

【5】F

【解析】

试题分析：本文的中心语是雪，从天气预报开始讲起，然后介绍了什么是雪，它是怎么形成的，接着讲了雪对声音的传播有什么影响。

【1】C考查对上下文的理解和推理判断能力。后面的两句话解释了两个原因，都是与雪有关，可知前面想说预测雪很难。故选C。

【2】B考查对上下文的理解和推理判断能力。后面一句出现了These crystals，these这个词说明前文已出现crystal。故选B。

【3】E考查对上下文的理解和推理判断能力。后一句About two and one-half centimeters of rain has as much water as 15 centimeters of wet snow .2.5厘米的雨水中的含水量与15厘米的雪的含水量一样，可知雪的含水量不高。故选E。

【4】G考查对上下文的理解和推理判断能力。前面一句Fresh snow is made largely of air trapped among the snow crystals . 雪是由于受阻碍的空气造成的，所以后面一句开始解释中间的原理。故选G。

【5】F考查对上下文的理解和推理判断能力。前面一句讲松软的雪会吸收声音，后面一句讲雪会将声波传送回去，可知雪在空格处应该发生了变化。故选F。