改错。

( ) 1. There is a missed button in the shirt. Can you have it checked?                                             

                               A                                               B           C

( ) 2. My jeans split at the seams yesterday. It made me really embarrasing.                                    

                            A   B                                                                C 

( ) 3. The shirt is stained. I'm going to have it dry-clean.                                                               

                                 A                           B           C

( ) 4. Look at the girl in red over there. It must have been Lily.                                                      

                                  A                              B         C

( ) 5. Mr. John wasn't at his office yesterday. He might go on business.                                         

                              A                                              B    C

射线的线质越硬，其光子能量越大，波长越短，衰减系数越小，半价层厚度（）。

A.越小

B.越大

C.不变

D.以上都不对