【单选题】

The third paragraph is concerned with ______.
A．how clouds rise in the air

B．how rain is formed
C．why water-vapor can float in the air
D．how clouds cause rain

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根据网考网移动考试中心的统计，该试题：

10%的考友选择了A选项

76%的考友选择了B选项

8%的考友选择了C选项

6%的考友选择了D选项

The third paragraph is concerned with ______.A．how clouds rise in the air