题目

It was a cool autumn day, a day to    36  . That was the day young women everywhere wait their whole lives for, and I knew in my heart I would   37   those moments forever.Before me stood a young man with whom I had   38   my secrets and delighted moments. I had whispered promises in his ear and did my best to   39   them. I had never trusted anyone with the   40   to my heart until he entered my life. Now I knew the only safe place for this key to remain was with him.This was a first for   41   of us. We gazed nervously in each other’s   42  , waiting for the othe设计实验探究元素X是否属于必需矿质元素，某同学的构思大致如下：? 本实验中采用甲组、乙组之间的空白对照，以及乙组中实验前（无X元素）与实验后（有X元素）之间的自身对照，其中属于对照组的分别是（     ）? A.甲组、实验前       B.甲组、实验后?    C.乙组、实验前       D.乙组、实验后