Much of the water we use comes from snow. Melting（融化） snow gives water to rivers and crops. Snowfall helps to protect plants and some wild animals from the cold. Fresh snow is made largely of air which is kept among the snow crystals. Because the air has trouble moving, the movement of heat is greatly reduced. However, snow is responsible for the deaths of hundreds of people in the United States every year. Many people die in traffic accidents on roads that are covered with snow or ice.

　　71. In the center of a snow crystal there is ______.

　　A. air  

　　B. water  

　　C. dust 

　　D. sunlight

　　72. If fifteen centimeters of snow completely melts, the height of water will be ______.

　　A. 0.5 centimeter 

　　B. 1centimeter 

　　C. 1.5 centimeters 

　　D. 15 centimeters

　　73. According to the text, snow looks white because _______.

　　A. snow is actually white                

　　B. the ice particles are white

　　C. the reflection of light makes it look white 

　　D. there is a lot of air in the snow

　　74. How can snow protect plants from the cold?

　　A. Snow gives them much heat.

　　B. Snow turns into water and waters them.

　　C. Snow makes them keep moving.

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