高二英语练习题25 (2)

语篇提能

Ⅰ.阅读理解

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 (晶体). 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.

语篇解读本文为一篇说明文。文章介绍了全球降雪的分布特点、作用及可能造成的危害。

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

答案与解析A推理判断题。根据文章首段前两句内容可知，地球的两极终年都有降雪。但是降雪量最大的地方是在山脉地区的冬季。因此可知，A项表述正确。

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

答案与解析B细节理解题。根据第三段前三句可知，降雪可以保护动植物免于严寒。这是因为雪里面含有大量的空气，这能够阻止热量的散失。故答案选B项。

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