【单选题】This book is worth ______.
【单选题】This book is worth _____.
【单选题】var_dump()函数用于查看变量的值和数据类型。分析以下代码,输出结果正确的是( )。
【单选题】This book is worth _____.
【判断题】Compared with second-intention healing, the inflammatory reaction of healing by first union is more intense.
【单选题】This book is worth twice.
【单选题】This book is worth ( )twice.