1.单选题- (共3题)

A.首先用图甲装置对滤液进行处理,其目的是去除相对分子质量较小的杂质 |
B.图乙装置的试管中收集到的液体中最先出现的是相对分子质量较小的蛋白质 |
C.用图乙装置分离血红蛋白时,待红色的蛋白质接近色谱柱底端时,用试管收集流出液,每管收集5mL,连续收集 |
D.图丙装置中电泳法分离提纯血红蛋白的原理是血红蛋白带有一定量的电荷,在电场的作用下向一极移动 |

A.细胞表面膜受体的化学本质为糖蛋白 |
B.神经递质和大多数激素属于第一信使 |
C.第二信使通过调控细胞核内发生的基因的翻译过程发挥作用 |
D.第一信使与膜受体结合体现了细胞膜的信息交流功能 |
2.选择题- (共1题)
Do you remember the last time you read a book, or a magazine? Is checking e-mails or updating microblog your daily reading habit? If you're one of those who don't make a habit of reading regularly, you might be really out.{#blank#}1{#/blank#}
Stress Reduction
No matter how much pressure you have at work, in your personal relationships, or other issues in daily life, it all just slips away when you lose yourself in a great story.{#blank#}2{#/blank#}
Knowledge
Everything you read fills your head with new information, and you never know when it might come into use.{#blank#}3{#/blank#}Besides, you might lose everything else—your job, your money, even your health, but knowledge can never be taken from you.
Vocabulary Expansion
{#blank#}4{#/blank#} As a result, this will gradually enlarge your everyday vocabulary. Then you might become more knowledgeable and well-spoken, which can increase your self confidence and even help you get promotions more quickly.
Better Writing Skills
Exposure to well-written work has a great effect on your own writing. In other words, writing styles of other authors will influence your own work.{#blank#}5{#/blank#}
Now that reading has so many benefits, step away from your computer and go hunting for something new to read!
A. Here are some benefits of reading.
B. Here are some suggestions for your health.
C. The more you read, the more words you gain exposure to.
D. This goes hand-in-hand with the expansion of your vocabulary.
E. A well-written novel can bring you pleasure, and allow you to relax.
F. The more knowledge you have, the better-equipped you are for your life.
G. That is why beginners always learn how to write by reading the works of others.
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【1】题量占比
单选题:(3道)
选择题:(1道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:1
7星难题:0
8星难题:0
9星难题:2