It was ______ that they went for a drive in the countryside.

A．such a fine weather

B．so fine a weather

C．such fine weather

D．so fine weather

瓦斯量大的煤仓（原煤仓、精煤仓和缓冲仓）及与其相通的房间和走廊，煤仓内瓦斯浓度达到（）时，附近20m范围内的电气设备立即停止运转。房间和走廊内瓦斯浓度达到（）时，立即切断全部非本质安全型电源（含照明电源）

A.2%，1.5%

B.1.5%，0.5%

C.1.5%，1%

D.1%，0.5%