题干
Professor White has written some short stories, but he is _____ known for his plays.
A：the best
B：more
C：better
D：the most
答案(点此获取答案解析）
C
A：the best
B：more
C：better
D：the most
在
上的最大值为3，最小值为2，则
的取值范围是 （ ）