It's already 10 o'clock. I wonder how it________that she was two hours late on such a short trip.
A:came over
B:came out
C:came about
D:came up
北京人距今约( )
据国家海洋局北海分局综合检测结果,2012年5月初日照以东海域出现赤潮,最大面积106.3平方公里,你认为以下哪项不可能是“赤潮”发生的原因