单词拼写。

1. Chinese history is filled with great ____________(成就) in science and technology    

2. She was ____________(满意的) with her birthday presents from her friends.        

3. When I came to the riverside, I found a boy ___________(挣扎) in the water.        

4. It is our duty to ____________(保卫) our motherland.                      

5.The four poles, ___________(支撑) the ceiling were well built.                    

6. He has made several ___________(发现)in science.                            

7. Children are taught to __________(尊敬)their teachers in the kindergarten.          

8."Mind your___________ (行为) , "the mother said to her young boy.              

9. I could hear them ____________(私语)under the tree over there .                  

10. Usually children are ____________(好奇的)about everything they see and meet.      

某串联电路上有A₁，A₂，A₃3个灯泡，如在某时刻A₁亮的概率为0.95，A₂亮的概率为0.90，

A₃亮的概率为0.96，则在此时刻只有A₂亮的概率为[ ]

A．0.003  

B．0.0003  

C．0.0018  

D．0.0024