题目

12. Everyone had an application from in his hand, but no one knew which office room _____. A) to send it to     B) to send it      C) to be sent to    D) to have it sent 答案：A燕麦胚芽鞘的向光性实验，能够证明生长素的一项生理作用是（    ）     A. 促进细胞生长　　　　    B. 促进光合作用     C. 促进果实发育　　　　    D. 促进扦插枝条生根