王先生，40岁。突发上腹刀割样剧痛4小时，来院急诊。查体：体温38.5℃，血压120/70mmHg，心率88次／分，呼吸20次／分。全腹压痛、反跳痛，伴腹肌紧张，以剑突下及右下腹为显著，肠鸣音消失，移动性浊音（+）。血白细胞9.0×109/L，中性粒细胞84%。
为明确病因诊断，首选检查项目是（）
A.急诊腹部CT
B.腹部B超
C.腹腔穿刺
D.直肠指诊
E.腹部立位平片
参考答案：E
It is easy for many people to catch a cold in the springtime or fall. It makes us wonder if scientists can send a man to the moon, why can’t they find a cure for the common cold? The answer is easy. There are actually hundreds of kinds of cold viruses out there. You never know which one you will get, so there isn’t a cure for each one. When a virus attacks your body, your body works hard to get rid of it. Blood rushes to your nose and cause a block in it. You feel terrible because you can’t breathe well, but your body is actually eating the virus. Your temperature goes up and you get a fever, but the heat of your body is killing the virus. You also have a runny nose to stop the virus from getting into your cells. You may feel very uncomfortable, but actually your wonderful body is doing everything it can to kill the cold. Different people do different things to deal with colds. In the United States and some other countries, for example, people might eat chicken soup to make themselves feel better. Some people take hot baths and drink warm liquids. Other people take medicine to stop various symptoms (症状) of colds. There is one interesting thing to note —some scientists say taking medicines when you have a cold is actually bad for you. The virus stays in you longer because your body doesn’t have a way to fight it and kill it. Bodies can do an amazing job on their own. There is a joke, however, on taking medicine when you have a cold. It goes like this: It takes about one week to get over a cold if you don’t take medicine, but it takes only seven days to get over a cold if you take medicine.
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