The shape of a snow crystal may change from one form to another as the crystal passes through levels of air with different temperatures. When melting snow crystals or raindrops fall through very cold air, they freeze to form small particles of ice, called sleet。
When snow crystals stick together, they produce snowflakes. Snowflakes come in different sizes. As many as one hundred crystals may join together to form a snowflake larger than two and one-half centimeters. Under some conditions, snowflakes can form that are five centimeters long. Usually, this requires near freezing temperatures, light winds and changing conditions in Earths atmosphere.
Snow contains much less water than rain. About fifteen centimeters of wet snow has as much water as two and a half centimeters of rain. About seventy-six centimeters of dry snow equals the water in two and one-half centimeters of rain。
Questions 26 to 28 are based on the passage you have just heard。
26. Whats the main subject of this passage?
27. Which statement is true about snow crystals?
28. What do we learn about snowflakes from the passage?
Passage Two
Some unusual words describe how a person spends his or her time. For example, someone who likes to spend a lot of time sitting or lying down while watching television is sometimes called a couch potato. A couch is a piece of furniture that people sit on while watching television。
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