下列检测器中利用外光电效应的有（）。A.光电管 B.光敏电阻 C.光敏二极管 D.光

     Should I be happy or sad? My oldest son is moving out of home.That in the sad part .The happy part is that he is following my foot steps. He is entering the oil patch(油田) and going to work on a rig (钻塔).     

     My son is 20 years old and it is time for him to move out but that doesn't make it any easier. No one wants to. see their children move out but as a father I would never stand in his way. I have three boys. My middle one has been away from home for about a year and my youngest one is still at home. The son that is leaving today is my fishing partner and I'm going to miss him when I'm walking along the river banks without him this summer.    

      I know today is going to be hard for my wife. Her baby is leaving home. The boys have grown up with their mom.I worked in the oil patch so I missed a lot but not my wife. She never missed a thing in their lives. She will have a bad day today.    

     I love my boy and I wish him all the safety and luck that he needs to be successful. 

1.The son who is moving out is the        son of the writer.   

A. first        

B. second      

C. third      

D. youngest

2. What did the writer use to do with the son who is moving out?     

A. Go shopping.          

B. Go fishing.      

C. Go to the movies.        

D. Go for a walk.

3. What does the underlined word" miss" mean?    

A. Fail to catch.            

B. Fail to see.    

C. Fail to understand.       

D. Fail to hear.   

4. Which of the following is true? 

A. The youngest son of the writer is 20 years old.      

B. The writer's sons have grown up with their grand parents.      

C. The writer's family has four members.      

D. The writer used to work in the oil patch.

读课文Lesson 15 Karen's Hair Stood Up!回答下列问题。

1. How many groups did they give talks?

    _________________________

2. What project did they talk about?

    _________________________

3. What was the weather like that day?

     _________________________

4. When did they give the talk?

     _________________________

5. Who showed some physics? 

     _________________________

下列属于会议目的的是（）

A.交流信息

B.做出决策

C.发现问题

D.给予指导

E.解决问题

社会主义职业道德区别于资本主义职业道德的特征是()

A、经济基础不同

B、指导原则不同

C、内容不同

D、国家或政府发挥的作用不同

下列除杂的实验过程都正确的是（括号内为杂质）（　　）

A．KCl（K₂CO₃）   加足量稀硫酸、过滤、蒸发、结晶

B．BaSO₄（BaCO₃） 加足量稀盐酸、过滤、洗涤、干燥

C．CuO（Cu）      加足量稀盐酸、过滤、洗涤、干燥

D．MnO₂（KCl）   加水溶解、过滤、蒸发、结晶