Generally, the color of snow and ice appears white. This is because the light we see from the sun is white. Most natural materials take in some sunlight. However, when light travels from air to snow, some light is sent back, or reflected(反射). Snow crystals have many surfaces to reflect sunlight. It is this light that gives snow its white color.

　　Much of the water we use comes from snow. Melting 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.

　　28. In the center of a snow crystal there is

　　.

　　A. air

　　B. water

　　C.dust

　　D. sunlight

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

　　.

　　A. 1 centimeter

　　B. 1.5 centimeters

　　C. 15centimeters

　　D. 0.5 centimeter

　　30. According to the text, snow looks white because

　　.

　　A. snow is actually white

　　B. the ice particles are white

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