男，40岁，黄疸，肝脾肿大半年，进食时突然呕吐暗红色液体300ml，其病因可能为（）

根据材料内容，从方框中选出恰当的短语或句子完成小题，使句子通顺、意思完整。

     In the past, many people used horses for traveling, farming and other kinds of work. A lot of people
still like to ride horses. And horse racing is also popular. So it is not surprising that Americans use this
animal when they talk.
     Long ago, rich or important people rode horses which were very tall. Today, if a girl acts like she is
better than everyone else, you might say she should get off her high horse.
     Yesterday my children wanted me to take them to the playground. But I had to finish my work, so
I said. "Hold your horses. Wait until I finish what I am doing." My two boys like to compete against each
other and play in a noisy and not very careful way. I always tell them to stop horsing around or someone
could get hurt."  
     Last night, I got a telephone call while I Was watching my favourite TV show. I decided not to answer
it because wild horses could not drag (拖， 拽) me away from the television. There was nothing that could
stop me from doing what I wanted to do. Sometimes you get information straight from the horse's mouth.
Let us say your teacher tells you there is going to be a test tomorrow. You could say you got the information
straight from the horse's mouth. You can lead a horse to water, but you cannot make him drink. That means
you can give someone advice but you cannot force him to do something he does not want to do.