题目

--It’s you. I _____you.    --I’ve just had my hair cut and I’m wearing new glasses.   A. didn’t recognize       B. hadn’t recognized  C. haven’t  recognized    D.  don’t recognize   答案：A下列物质中含有磷元素的是（ ）A.抗体B.核糖核酸C.甘油三酯D.纤维素