题目

----Why do you look so_ __? ----Because my son got lost when I was in the shop. A. worried     B. tired        C. busy           D.surprised 答案：A“人间四月芳菲尽，山寺桃花始盛开，”造成这一差异的环境因素是（ ）A．光 B．水分 C．温度 D．湿度