单项选择题

Questions 24～25 are based on the talk you’ve just heard. How are clouds classified

A．According to their size.
B．According to their shape.
C．According to their colour.
D．According to their height above sea level.

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单项选择题

单项选择题

Questions 24～25 are based on the talk you’ve just heard. How are clouds classified 您的浏览器不支持 audio 元素。