第22题: [单项选择]In American universities, classes are often arranged in more flexible ______ and many jobs on campus are reserved for students. A. scales B. ranks C. grades D. patterns 参考答案:D 答案解析:pattern意为“模式,方式”,如:The illness is not following its usual pattern.这种疾病不是循着它惯常的方式发展。scale意为“规模,尺度”,如: