下列几何体的三视图中，左视图是圆的是（　　）

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    China is a big country. The weather in the south(南方)is different from that in the north(北方). Beijing is a beautiful city of China. In this city, spring is warm; summer is hot; autumn is cool and winter is cold. But in the south of China, it is always warm. In Hong Kong and Sanya, people like to swim in the sea. They can't see snow. In the north of China, people can make snowmen and play with snowballs in winter. People like to spend their holiday(度假) in the south in winter, and in the north in summer.