2015年1月华北地区多次出现雾霾天气，图是该区域1月15日

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2015年1月华北地区多次出现雾霾天气，图是该区域1月15日—16日的空气质量分布图。读图完成下题。

该时段区域内有一次明显的锋面活动，推测16日11时锋线的大致位置

A．甲线附近	B．乙线附近
C．丙线附近	D．丁线附近

有关下列地区污染物浓度变化的原因，正确的是

A．A地因在冷空气源地附近，风力强，污染物浓度下降

B．B地因吹偏南风，湿度上升，污染物浓度将升高

C．C地因位于锋后，盛行上升气流，污染物浓度升高

D．D地因冷暖空气相遇，挤压聚集，污染物浓度升高

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