SnowfallsintheEarth’sextremeNorthandSouththroughoutthey...
問題詳情:
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. 16 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. 17 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.
18 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. 19
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. 20
A. These include food, emergency medical supplies, and extra clothing to stay warm and dry.
B. Snow also influences the movement of sound waves.
C. Melting snow provides water for rivers, electric power stations and agricultural crops.
D. Mountain snowfall is heavier than that in the South and the North Poles.
E. In many places, streets were blocked; houses fell down and supplies were short.
F. Others die from heart attacks caused by too much physical activity out in the cold.
G. Snow may be beautiful, but it can be deadly.
【回答】
CBGFA
知識點:七選五題型
題型:閱讀填空
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一個質量為4kg的物體靜止在足夠大的光滑水平地面上.從t=0開始,物體受到一個大小和方向週期*變化的水平力F作...
問題詳情:一個質量為4kg的物體靜止在足夠大的光滑水平地面上.從t=0開始,物體受到一個大小和方向週期*變化的水平力F作用,力F的變化規律如圖所示.則( )A.t=2s時物體沿負方向運動的位移最大B.t=4s時物體運動的位移達最小值C.每個週期內物體的速度變化為一定值D.從t=0開...
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如圖,形狀相同、大小相等的兩個小木塊放在一起,其俯檢視如圖所示,則其主檢視是( ).
問題詳情:如圖,形狀相同、大小相等的兩個小木塊放在一起,其俯檢視如圖所示,則其主檢視是( ).【回答】D知識點:三檢視題型:選擇題...
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用若干個體積為1的正方體搭成一個幾何體,其正檢視、側檢視都是如圖所示的圖形,則這個幾何體的最大體積與最小體積的...
問題詳情:用若干個體積為1的正方體搭成一個幾何體,其正檢視、側檢視都是如圖所示的圖形,則這個幾何體的最大體積與最小體積的差是()A.2B.3C.4D.5【回答】解析:由正檢視、側檢視可知,此幾何體的體積最小時,底層有5個小正方體,上面有2個小正方體,共7個小正方體;體積最大時,底...
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閱讀下面唐詩,完成①―③題。(10分)書邊事。張喬調角斷清秋,徵人倚戍樓。春風對青冢,白日落梁州②。大漠無兵阻...
問題詳情:閱讀下面唐詩,完成①―③題。(10分)書邊事。張喬調角斷清秋,徵人倚戍樓。春風對青冢,白日落梁州②。大漠無兵阻,窮邊有客遊。蕃情似此水,長願向南流。註釋①:唐朝自肅宗以後,河西、隴右一帶長期為吐蕃所佔。此後,因民眾起義及吐蕃將領降唐,其地又全歸唐朝所有。本...
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