24小时咯血量超过多少为大咯血（）
A.50ml
B.100ml
C.200ml
D.300ml
E.500ml
参考答案：E
解析：咯血是指喉及其以下呼吸道或肺组织出血，经口腔咳出。一般认为，24小时内咯血量少于100ml为少量咯血，100～500ml为中量咯血，24小时咯血量大于500ml或一次咯血量大于100ml为大量咯血。
阅读下面短文，把A—D 四个句子填入文中空缺处，使短文内容完整、正确，然后完成第75小题。 （ 每小题2 分， 共10分 ） At school many things happen to us. We may feel excited when we have success in a school play. _____71_____ We want to keep the memory for the rest of our lives. How to keep the memory? Our English teacher, Miss Wang, has taught us a good way of remembering things. It is to make our own yearbook. What is a yearbook? _____72_______ It’s usually made at the end of the year. Last December, we began to make our yearbook. ______73______Then some students interviewed them, some wrote down their stories, others took photos of them. ____74______ Finally, our teacher helped us to put the things together. We had our first yearbook. All of us put a lot of love into making the yearbook. It is so wonderful that not only the students but also our parents and teachers will remember the special time for ever.
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外，其他牙齿牙根大多不同程度向远中弯曲