题目

 Until now, we have raised 50, 000 pounds for the poor children, is quite unexpected. A. that     B. which C. who    D. it 答案：B“人间四月芳菲尽，山寺桃花始盛开”，你认为造成这一现象的主要非生物因素是 [     ]A．光 B．水 C．温度 D．湿度