对蒸腾作用的叙述,其中不正确的是:[ ]
A.是植物吸收水分和矿质元素的主要动力
B.促进水分在植物体内的运输
C.促进矿质元素在植物体内的运输
D.降低叶片温度,避免日照灼伤
答案:A
— Did you arrive here this morning?
— Yes, it was at nine o'clock _____ we came here. [ ]
A. when
B. before
C. which
D. that
电动模型飞机