找出下列问题的正确答案。

( ) 1. What's the time?                  

( ) 2. Why do you like music?              

( ) 3. What time do you go to work?        

( )4. Do you have any oranges?            

( ) 5. How many brothers do you have?      

( ) 6. What can you do?                  

( ) 7. Where is the baseball?              

( )8. What's your favorite subject?                                          

a. I can swim.

b. Under the bed.

c. Only one.

d. At 8:30.

e. Because it's relaxing.

f.  P.E.

g. It's seven o'clock.

h. No, I can't.       

i. Yes, I do.

试述医疗保险与商业医疗保险的关系