根据《国务院关于投资体制改革的决定》的规定，政府投资项目实行______的投资管理体

假性妊娠囊最可能由哪种情况产生（）。

A.卵黄囊

B.子宫内膜蜕膜变化

C.卵巢功能不全

D.黄体囊肿

阅读理解。

     "Mister D'Arcy is not a policeman. He is however, very wise. He knew the police would search his

apartment. He also knew how police think. So, he did not hide the letter where he knew they would look

for it.

     "Do you remember how Germont laughed when I said the mystery was difficult for him to work out

because it was so simple?"

     Dupin filled his pipe with tobacco and lit it. "Well, the more I thought about it, the more I realized the

police could not find the letter because D'Arcy had not hidden it at all.

     "So I went to visit D'Arcy in his apartment. I took a pair of dark green eyeglasses with me. I explained

to him that I was having trouble with my eyes and needed to wear the dark glasses at all times. He

believed me. The glasses permitted me to look around the apartment while I seemed only to be talking to

him.

     "I paid special attention to a large desk where there were a lot of papers and books. However, I saw

nothing suspicious there. After a few minutes, however, I noticed a small shelf over the fireplace. A few

postcards and a letter were lying on the shelf. The letter looked very old and dirty.

     "As soon as I saw this letter, I decided it must be the one I was looking for. It must be, even though it was completely different from the one Germont had described.

     "This letter had a large green stamp on it. The address was written in small letters in blue ink. I

memorized every detail of the letter while I talked to D'Arcy. Then when he was not looking, I dropped

one of my gloves on the floor under my chair.

     "The next morning, I stopped at his apartment to look for my glove. While we were talking, we heard

people shouting in the street. D'Arcy went to the window and looked out. Quickly, I stepped to the shelf

and put the letter in my pocket. Then I replaced it with a letter that looked exactly like it, which I had

taken with me. I had made it the night before.

     "The trouble in the street was caused by a man who had almost been run over by a horse and carriage.He was not hurt. And soon the crowd of people went away. When it was over, D'Arcy came away from

the window. I said goodbye and left.

     "The man who almost had an accident was one of my servants(雇员). I had paid him to create the

incident."

     Dupin stopped talking to light his pipe. I did not understand. "But, Dupin," I said, "why did you go to

the trouble of replacing the letter? Why not just take it and leave"

     Dupin smiled. "D'Arcy is a dangerous man," he said. "And he has many loyal servants. If I had taken

the letter, I might never have left his apartment alive."

1. What is Dupin probably?

A. A captain.            

B. A detective.    

C. An official.          

D. A professor.

2. Why was Dupin wearing a pair of dark green eyeglasses while calling at D'Arcy's ? 

A. Because he wanted to be look more handsome.

B. Because there was something wrong with his eyes.

C. Because he could see more clearly wearing the eyeglasses .

D. Because the glasses enabled him to look around without being noticed .

3. Dupin dropped one of his gloves to ___ . 

A. pay a visit to D'Arcy again.        

B. leave some evidence

C. send it to D'Arcy as a gift.    

D. imply something to D'Arcy

4. According to the text, we can infer_______. 

A. D'Arcy asked his loyal servants to kill Dupin 

B. Mr. D'Arcy and Dupin were good friends.

C. the incident in the street was directed by Dupin.

D. Dupin should have taken the letter away directly.

5. Which would be the best title for the text? 

A. The stolen letter      

B. An unexpected accident

C. A dangerous man      

D. The unbelievable apartment

双轮缘车轮工作表面宽度比轨顶稍宽，对于大车车轮取（）mm。

A、30-40

B、10~20

C、5~10

D、5

网络通信软件的任务是根据通信协议来控制和管理（）的通信。

熟悉传染病的潜伏期，是为了（）

A.确定诊断

B.确定检疫期

C.预测流行趋势

D.追踪传染来源

E.有助于指导治疗