设某次外语统考的成绩服从正态分布N(78,49)，则学生成绩高于71分的概率为（   ）

单项选择题我军鲜明特色和政治优势是（ ）

单项选择题Hyperinflation is a very high, rapid, and continuous ( ), within which the prices of goods and services quickly rise to a level so high.