Question

【題目】根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。

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（顆粒）. 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】

試題分析：本文的中心語是雪，從天氣預(yù)報開始講起，然后介紹了什么是雪，它是怎么形成的，接著講了雪對聲音的傳播有什么影響。

【1】C考查對上下文的理解和推理判斷能力。后面的兩句話解釋了兩個原因，都是與雪有關(guān)，可知前面想說預(yù)測雪很難。故選C。

【2】B考查對上下文的理解和推理判斷能力。后面一句出現(xiàn)了These crystals，these這個詞說明前文已出現(xiàn)crystal。故選B。

【3】E考查對上下文的理解和推理判斷能力。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與15厘米的雪的含水量一樣，可知雪的含水量不高。故選E。

【4】G考查對上下文的理解和推理判斷能力。前面一句Fresh snow is made largely of air trapped among the snow crystals . 雪是由于受阻礙的空氣造成的，所以后面一句開始解釋中間的原理。故選G。

【5】F考查對上下文的理解和推理判斷能力。前面一句講松軟的雪會吸收聲音，后面一句講雪會將聲波傳送回去，可知雪在空格處應(yīng)該發(fā)生了變化。故選F。