Question

Snow falls in the Earth’s extreme North and South throughout the year. However， the heaviest snowfalls have been reported in the mountains of other areas during winter. Snow is even known to fall near the Equator (赤道)，but only on the highest mountains.

Snow contains much less water than rain, but much of the water the world uses comes from snow. Melting snow provides water for rivers, electric power stations and agricultural crops. In the western United States, mountain snow provides up to seventy-five percent of all surface water supplies.

Snowfall helps to protect plants and some wild animals from winter weather. Fresh snow is made largely of air trapped among the snow crystals (晶體). Because the air has trouble moving, the movement of heat is limited. Snow also influences the movement of sound waves. The surface of the snow takes in, or absorbs, sound waves. As snow grows older or if there have been strong winds, it can become hard and flat. Then, the snow，s surface will help to send back sound waves.

Snow may be beautiful, but it can be deadly. It is responsible for the deaths of hundreds of people. Many people die in traffic accidents on roads covered with snow and ice or from being seriously stuck in the winter storm. Others die from heart attacks caused by too much physical activity out in the cold.

People may not be able to avoid living in areas where it snows often. However, they can avoid becoming victims of snowstorms. People should stop driving and stay at home until the storm has passed. People living in these areas should carry emergency supplies in their vehicle. These include food，emergency medical supplies，and extra clothing to stay warm and dry.

1.Mountain snowfall _____.

A．is heavier than that in the South and the North Poles

B．has never occurred near the Equator of the earth

C．brings less of the water the world uses than rain does

D．provides up to seventy—five percent of water supplies worldwide

2.Snow protects plants and wild animals from cold weather by _____.

A．supplying much more air                  B．limiting heat movement

C．absorbing strong winds                   D．sending back sound waves

3.Snow can be deadly mainly because it can _____.

A．cause road accidents

B．make people stuck in winter storms

C．lead to heart attacks

D．make people victims of snowstorms

4.What will the text probably tell us following the last paragraph? _.

A．How to drive during snowstorms

B．Where we can get emergency supplies

C．How to prevent heart attacks out in cold

D．Why we should stay warm and dry in winter

 

Answer 1

【答案】

1.A

2.B

3.D

4.C

【解析】

試題分析：文章講述了雪的作用，能幫助動植物過冬，是主要的水的來源，及講到了如何來避免在暴風雪中成為受害者。

1.細節題。文章第一自然段Snow falls in the Earth’s extreme North and South throughout the year. However， the heaviest snowfalls have been reported in the mountains of other areas during winter.可知，南極或北極終年積雪，但是，最大的雪卻經常發生在山區。可知，山區的雪量比南北極的大。

2.細節題。從第三自然段Because the air has trouble moving, the movement of heat is limited.可知雪能夠保護動植物過冬，是因為它能夠阻止熱的散失。故選B。

3.細節題。從第二自然段及第三自然段People may not be able to avoid living in areas where it snows often. However, they can avoid becoming victims of snowstorms.可知，A,B,C選項只是某一方面，并不全面，D選項回答更為全面。使人們成為了暴風雪的受害者。

4.細節推斷題。從文章最后一句話可知，人們應該常備一些急救的藥物或溫暖的衣服，所以接下來應該是講在冬天的戶外如何來防止心臟病的發生。故選C。

考點：說明文

點評：本文文脈清晰，對雪的自然現象、雪的作用及如何避免受傷三方面進行了說明。把握好這條主線，文章細節題居多，題目設置也不難，只需仔細的將問題和文章進行對比即可得出正確的答案。