问题
单项选择题 A1/A2型题
服用阿司匹林后出现呕血，其原因是（）
A.急性胃黏膜病变
B.消化性溃疡
C.急性胰腺炎
D.食管炎
E.胃黏膜脱垂
答案
参考答案：A
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服用阿司匹林后出现呕血，其原因是（）
A.急性胃黏膜病变
B.消化性溃疡
C.急性胰腺炎
D.食管炎
E.胃黏膜脱垂
参考答案：A
American _____ begins _____ September after a long ______ holiday. There are ______ terms in a school ______. The first term is from ______ to January, and _____ is from February to June. ______ American children begin to go to _____ when they are five years old. Most students are seventeen to eighteen years old when they finish high school. High school students in America take only five __ __ six subjects each term. They usually go to the same class every day, and they have homework for every class. After _____ they do all kinds of interesting things. After high school, many students go to college(大学). They can go to a small or a large one. They usually have to give _____ money. So, many ____ students work after school _____ money ____ their studies.
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