Every morning the pupils read the texts ____ in the classroom.

A．on the top of their voices

B．on the top of their voice

C．at the top of their voices

D．at the top of their voice

天气预报有红色警报、黄色警报、橙色警报和蓝色警报。下列不属于橙色警报的是( )

A．3小时内地区降雨量将达50毫米以上

B．6小时内某地有冰雹并伴随雷电天气，并可能造成雹灾

C．6小时内可能出现能见度小于200米的浓雾

D．12小时内阵风9级以上