阅读理解。 My name is Katrina．When I was nine years old, I often played on my elder brother's waterbed (水床)．He had a lot of coins and I often put them in my mouth and played with them． One day, I had one coin in my mouth and the waterbed started moving．As a result, the movement made me choke(噎住)on the coin．I ran into the living room coughing with my hand around my throat．My mom ran towards me．Before she could get to me, I gave one strong cough and swallowed(吞)the coin! I let my mom know that I had choked on a coin and swallowed it．So, she called up my elder brother and then I w as taken to the hospital．It turned out that the coin was right in my esophagus (食道); it didn't move at all．I had to get doctors to take the coin out．They put me to sleep, put something with a camera down my throat and pulled the coin out． Ever since I got out of the hospital, my family and friends have enjoyed calling me 'The Human Piggy Bank'．What an embarrassing experience! Now I still have the coin in a pot! Interesting souvenirs! 1．The accident happened when I played on ______． A．my bed B．my elder brother's waterbed C．my parents' bed D．my little brother's waterbed 2．I was choke on the coin because ______． A．the waterbed started moving B．the waterbed stopped moving C．the door started mo ving D．I was very excited 3．______ came to help me first． A．My mother B．My brother C．My father D．The doctor 4．According to the passage, which of the following is right? A．The story happened when the girl was ten years old． B．The strong cough made the girl swallow the coin in the end! C．They called the hospital and the doctors took her to hospital． D．Her family and friends have enjoyed calling her 'Piggy Bank' after that． 5．What's the best title of the passage? A．A little girl． B．A coin． C．Waterbed． D．Embarrassing experience．