关于核小体的说法中，正确的是（）。A.核小体的形成在DNA的任何

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问题单项选择题

关于核小体的说法中，正确的是（）。

A.核小体的形成在DNA的任何部位上都可以发生

B.在DNA复制时，缠绕在核小体上的DNA不被复制

C.H3和H4蛋白的乙酰化会导致核小体结构更加稳定

D.DNA上的关键调控元件常不在核小体上

答案

参考答案：C

阅读理解

阅读理解。

It's seven thirty now. It's time to go to school. Our classroom is behind the trees.It's very nice. There

is a map of China on the wall. Twenty boys and fifteen girls are in the classroom. There are some flowers

on the teacher's desk. They are for our teachers. We have four classes in the morning and two in the

afternoon. We aren't at school on Sunday.

1. The students go to school at_____.

A. 7:13

B. 7:03

C. 7:30

2.Their classroom is_____some trees.

A. behind

B. in

C. under

3. A map of China is on the_____.

A. desk

B. wall

C. blackboard

4. The_____are for the teachers.

A. maps

B. desks

C. flowers

5. There are_____students in this class.

A. forty-five

B. fifteen

C. thirty-five

单项选择题

特色商店的特色主要表现在其所经营的商品或服务的特殊性，以及经营方式的（）。

A.一致性

B.灵活性

C.完整性

D.综合性