问题 单项选择题

关于酶的化学修饰的描述,错误的是

A.被修饰的酶一般有两种不同的活性形式

B.化学修饰的方式多为磷酸化和脱磷酸

C.化学修饰一般不消耗能量

D.催化互变的酶活性受激素等因素的控制

答案

参考答案:C

阅读理解

阅读理解。

                                                                        A letter

Dear Li Ting,

     My new school is very nice. There are 50 students in my class. Two girls are America. But they can speak

Chinese very well. Their fathers work in our city. Billy is an English boy. He comes from London. He can speak little Chinese. They like China very much. They also like our Chinese food. They are very friendly. How many

Chinese students are there in our class? How many Young Pioneers are there in our class? Can you guess?

Please write soon!

                                                                                                                              Love from

                                                                                                                                Liu Tan

1. Who writes the letter?

____________________________________________

2. The two girls are from __________________ .

3. Do they like Chinese food?

_________________________________________________

4. 将划线句子翻译成汉语.

_________________________________________________

5. How many Chinese students are there in the class?

_______________________________

判断题