---This is the first time I _____ my first picture with my own hands.

--- It’s time that you ____ a photo of me.

A．took; took

B．have taken; took

C．took; will take

D．will take; have taken

对植物来说，主要营养因子（）。

A.矿质元素

B.有机物

C.太阳能

D.大气