亲和素_爱下问搜题

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问题名词解释

亲和素

答案

参考答案：

是从卵白蛋白中提取的一种碱性糖蛋白，和生物素结合后十分稳定。每个亲和素能结合4个分子的生物素。

完形填空

第二节：完形填空（共20小题；每小题1.5分，满分30分）

阅读下面短文，掌握其大意，然后从36-55各题所给的四个选项中，选出最佳选项。

Growing up, I had a scar on my face — a perfect arrow in the center of my cheek, pointing at my left eye. I 36 it when I was three, long before I knew that scars were a 37 thing, especially for a girl. I only knew that my scar brought me 38 and tenderness and candy. As I got older, I began to take 39in my scar, in part to stop people laughing at me, but mainly as a reaction to the thought that I should feel uncomfortable. It’s true. I was 40 the first couple of times someone pointed at my 41 and asked, “What’s that?” or called me “Scarface.” But the more I heard how 42 my scar was, the more I found myself liking it.

When I turned fifteen, my parents — 43 the advice of a doctor — decided it was time to 44 on what was now a thick, shiny red scar.

“But I don’t mind the scar, really,” I told my father as he 45 that I would have the operation during my summer vacation. And my friends, along with my boyfriend at the time, 46 as I did, that my scar was 47 and almost pretty in its own way. After so many years, it was a 48 of me. But my father said it was a deformity (畸形). I don’t know what 49 more that day: hearing my father call my scar a deformity, 50 realizing that it didn’t 51 to him how I felt about it.

I did have the operation that summer.

In my late twenties, I took a long look at my scar, something I hadn’t done in years. 52, it could be seen in the right light, but no one 53 me about it anymore. As I leaned uneasily toward the mirror, I felt a sudden 54.