下列有关真空上料器的作用中，描述不正确的是（）A、吸料 B、吸料时在密封的料斗内形成一

最先证明地球是球体的是（　　）

A．麦哲伦的环球航行

B．人造地球卫星的发射与使用

C．哥伦布到达美洲大陆

D．大地测量技术的发展与进步

从罗马法的产生发展过程，可以清晰看到人类社会法律的产生和演变的发展过程。罗马法发展的过程中，合乎逻辑的演变是                   

A．习惯法—习惯总结—习惯—成文法

B．法律理论—习惯—成文法—习惯法

C．成文法—习惯—法律总结—习惯法

D．习惯—习惯法—成文法—法律总结

展览会

阅读理解

     The clock struck eleven at night. The whole house was quiet. Everyone was in bed except me. Under

the strong light, I looked sadly before me at a huge pile of that troublesome stuff they call "books".

     I was going to have my examination the next day. "When can I go to bed?" I asked myself. I didn't

answer. In fact I dared not.

     The clock struck twelve. "Oh, dear!" I cried. "Ten more books to read before I can go to bed!" We

pupils are the most wretched creatures in the world. Dad does not agree with me on this. He did not have

to work so hard when he was a boy.

     The clock struck one. I was quite desperate now. I forgot all I had learned. I was too tired to go on.

I did the only thing I could. I prayed, "Oh God, please help me pass the exam tomorrow. I do promise to work hard afterwards, Amen." My eyes were so heavy that I could hardly open them. A few minutes

later, with my head on the desk, I fell asleep.   

1. The underlined word "wretched" in Paragraph 3 probably means ____________.

A. happy          

B. disappointed          

C. unhappy          

D. hopeful

2. Reviewing his lessons that night didn't help him because ____________.

A. it was too late at night                    

B. he was very tired

C. his eyelids were so heavy that he couldn't keep them open

D. he hadn't studied hard before the examination

3. What do you suppose probably happened to the author the next day?

A. He went to a church to pray again.          

B. He passed the exam all by luck.

C. He failed in the exam.                    

D. He was punished by his teacher.

4. The best title for the passage would be ____________.

A. The Night Before the Examination          

B. Working Far into the Night

C. A Slow Student                        

D. Going Over My Lessons

将等量的唾液和清水分别滴入盛有等量馒头碎屑的试管A和试管B内，搅拌均匀，再将两只试管放在37℃的温水中10分钟，取出试管并滴入碘液，发现A不变蓝、B变蓝．该实验可以得出的结论（　　）

A．唾液不能使淀粉发生变化

B．清水可以将淀粉分解成其他物质

C．唾液可以将淀粉分解为葡萄糖

D．唾液可以将淀粉分解成其他物质