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黄嘌呤氧化酶参与
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Directions：This section is to test your ability to understand short conversations．There are 2 recorded conversations in it．After each conversation，there are some recorded questions．Both the conversations and questions will be spoken two times．When you hear a question，you should decide on the correct answer from the 4 choices marked A)，B)，C) and D) given in your test paper． Conversation 1
患者，男，35岁，间断便血3个月，无发热。 为明确诊断，应进行的关键检查是
肺充气时引起呼气的反射是
患者，男，35岁，间断便血3个月，无发热。 首先应进行的检查是
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