读对话，选择合适的句子补全对话，将字母标号填写在横线上。
A. What’s wrong with you? B. What happened to your leg?
C. That was very dangerous. D. Why did you stand on your bike?
A. What’s wrong with you? B. What happened to your leg?
C. That was very dangerous. D. Why did you stand on your bike?
Doctor: 1.__________
Bob: My leg aches terribly.
Doctor: 2.__________
Bob: I stood on my bike this morning and hurt my leg.
Doctor: 3.__________
Bob: Because I wanted to practice acrobatics(杂技). I’m very interested in it. I thought it was very easy but it wasn’t.
Doctor: 4.__________ We’ll have to take an X-ray first.
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