Precipitation, commonly referred to as rainfall(降雨量), is a measure of the quantity of water in the form of either rain, hall(雹子), or snow which reaches the ground, The average annual(每年的) precipitation over the whole of the United States is thirty-six inches. It should be understood, however, that a foot of snow is not equal to a foot of precipitation. A general formula(公式) for computing the precipitation of snowfall(降雪量) is that thirty-- eight inches of snow is equal to one inch of precipitation. In New York State, for example, seventy-six inches of snow in one year would be recorded as only two inches of precipitation. The total annual precipitation Forty inches of rain would be recorded as forty inches of precipitation. The total annual precipitation would be recorded as forty-two inches.

　　1. The word “precipitation” includes _____.

　　A. only rainfall B. rain, hail, and snow

　　C. rain, snow, and fog D. rain, snow, and ice

　　2. What is the average annual rainfall in inches in the United States?

　　A. Thirty-six inches B. Thirty-eight inches

　　C. Forty inches D. Forty-two inches

　　3. If a state has 152 inches of snow in a year. by how much does this increase the annual precipitation?

　　A. By two feet B. By four inches C, By four feet D. By 152 inches

　　4. Another word which is often used in place of precipitation is ______.

　　A. wetness B. snowfall C. rainfall D. dryness

　　答案：

　　1B 2 A 3 B 4 C