急性胃炎的病因有
A．急性感染
B．急性应激
C．胆汁反流
D．药物刺激
E．以上均是
参考答案：E
Tom wanted to buy a new computer, but he couldn’t _____ it.[ ]
A. buy
B. pay for
C. afford
D. spend
遇到服装奇异、举止特殊的客人时该怎么办？
