D. make people dog-tired 69. It has been really hot these days, as _______.

　　A. it rains cats and dogs     

　　B. we are having the dog days of summer

　　C. we’re leading a dog’s life 

　　D. we’re in the dog’s house 70. What does the text mainly talk about?

　　A. Expressions in American culture. 

　　B. Some expressions with the word dog

　　C. A  good way to learn English well

　　D. Dog’s influence on American culture

　　D

　　Winter weather has returned to northern areas of the world. In much of the United States, winter means the return of snow.

　　Snow is a form of frozen water. It contains many groups of very small ice particles (颗粒)called snow crystals(晶体). These crystals grow from water particles in cold clouds. They usually grow around a piece of dust. All snow crystals have six sides, but they grow in different shapes. The shape depends mainly on the temperature and water levels in the air. The shape of a snow crystal may change from one form to another as the crystal passes through levels of air with different temperatures. Snow contains much less water than rain. About 75 cm of snow has as much water as 2.5cm of rain.

　　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.

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