新视野大学英语视听说教程 4 Unit 3-4

 

Task3: A Blizzard¹
Script
A blizzard is a sever² weather condition characterized by low temperatures and strong winds, greater than 15 miles per hour, bearing a great amount of snow.
Because the factors for classifying winter storms are complex, there are many different definitions of what a blizzard truly is. But it is generally agreed that in order to be classified as a blizzard, as opposed to merely a winter storm, the weather must meet several conditions. The storm must decrease visibility to a quarter of a mile for three hours running. Include snow or ice as precipitation, and have wind speed of at least 32 miles per hour, which means Force 7 or more on the Wind Scale.
Another standard, according to Environment Canada, is that the winter storm must have winds of 40 kilometers per hour or mi=ore, plenty of snow, visibility less than 1 kilometer, a temperature of less than -25 degrees Celsius³, and all of these conditions must last for 4 hours or more, before the storm can properly be called a blizzard.
When all these conditions continue after snow has stopped falling, the storm is referred t o as a ground blizzard.
An extensive form of blizzard is a whiteout, when the downdrafts, together with snowfall, become so sever that it is impossible to distinguish the ground from the air. People caught in a whiteout can quickly become disoriented, losing their sense of up and down as well as their sense of direction. Severe blizzard can also occur along with arctic cyclones⁴.

1. What is the passage mainly about?
2. Which of the following is true of a blizzard according to the first standard?
3. Which of the following is true of a blizzard according to the second standard?
4. What is a ground blizzard?
5.  Which of the following is in the order of increasing force?

 

Keys: 1A 2.B3. C 4.D 5.C

For Reference
They can quickly become disoriented, losing their sense of up and down as well as their sense of direction.

1 blizzard   

n.暴风雪

参考例句：

• The blizzard struck while we were still on the mountain.我们还在山上的时候暴风雪就袭来了。
• You'll have to stay here until the blizzard blows itself off.你得等暴风雪停了再走。

2 sever   

v.切开，割开；断绝，中断

参考例句：

• She wanted to sever all her connections with the firm.她想断绝和那家公司的所有联系。
• We must never sever the cultural vein of our nation.我们不能割断民族的文化血脉。

3 Celsius   

adj.摄氏温度计的，摄氏的

参考例句：

• The temperature tonight will fall to seven degrees Celsius.今晚气温将下降到七摄氏度。
• The maximum temperature in July may be 36 degrees Celsius.七月份最高温度可能达到36摄氏度。

4 cyclones   

n.气旋( cyclone的名词复数 )；旋风；飓风；暴风

参考例句：

• The pricipal objective in designing cyclones is to create a vortex. 设计旋风除尘器的主要目的在于造成涡旋运动。 来自辞典例句
• Middle-latitude cyclones originate at the popar front. 中纬度地区的气旋发源于极锋。 来自辞典例句