我国实施义务教育的法律保证是()。A．《宪法》 B．《素质教育法》 C．《义务教育法

阅读表达。

     It was an exciting day as I first entered the classroom for my first lesson in the USA. My heart was beating

very hard when the professor asked everyone to introduce themselves. I was very anxious and did not hear

anyone else's introduction. I buried myself in what I was going to say.

     Classes went on and I noticed my American classmates were very active in class. My unwillingness to speak

during class started to worry me when I realized that I was ignored in class. But I did not give up. One simple

way I broke down this fear of speaking was to arrive 10 to 15 minutes earlier at the classroom. It gave me time

to _____ class discussions.

     The person whom I feared most was the professor. So I found every chance to speak with him before and

after class. When I did not have the chance to talk with the professor in class, I wrote an e-mail or made a date

with him outside the class with questions I had. These were very effective ways to help me speak freely in

class! Since the chance of expressing myself in class was limited, I finished all of my reading and written tasks

before class. One time, the professor asked a question about the reading homework. The whole class was silent

and I suddenly raised my hand and answered it perfectly! That moment I set the world on fire.

     Once I started participating in class, I realized how valuable it was. Class discussion was the best way to

learn and memorize things. It also made class a living and enjoyable experience. Participating in class is also like

climbing a ladder. I often prepared very simple questions to use at the beginning of class. Once I started to

speak, it was easier to speak up more. Classroom is the place to learn, so no one would consider you as a fool

even if you put forward simple questions in class.

1. What is the best title of the passage? (Please answer within 10 words.)

    ______________________________________________________________________________________

2. Which sentence in the passage can be replaced by the following one? I was busy in preparing what I was

    going to say. 

    ______________________________________________________________________________________

3. Which word or phrase can be replaced by the underlined word "participating"? (Please answer within 5

    words.) 

    ______________________________________________________________________________________

4. Please fill in the blank with proper words or phrases to complete the passage. (Please answer within 5 words.)

     ______________________________________________________________________________________

5. Translate the underlined sentence into Chinese. 

    ______________________________________________________________________________________

下面描述的现象中，能够说明分子在不停地做无规则运动的是（   ）

A．春风杨柳万千条

B．夏日炎炎似火烧

C．金秋桂花遍地香

D．寒冬北国白雪飘

需求是连续的，所以始终可以对需求进行预测。( )

什么是保护生态环境的根本之策？

下列哪项具有MHC限制性

A．ADCC
B．巨噬细胞吞噬抗原
C．补体介导的细胞溶解
D．Tc杀伤靶细胞
E．B细胞识别抗原