改错。下列各题划线部分中有一处是错的，请找出来并在横线上改正。
(     ) 1. Hello! I'm Linda. I'm a Nurse.                                                 
              A              B               C
(     ) 2. Is your unbrella blown?                                                          
                  A        B        C
(     ) 3. That's isn't my cat.                                                                
               A      B    C
(     ) 4. — What colour is this? — It's a red.                                        
                             A                     B  C
(     ) 5. My book is green an orange.                                                    
                    A          B    C

【考点】字母,单词、词组,零冠词，不用冠词,系动词,连词

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