题目

--- How much do you think the coat will _____?   --- Not much. It is _____ 50 dollars at the most. A. cost; worth      B. worth; cost      C. take; cost      D. need; worth 答案：A 解析: cost用作动词, 意思为 “花费”, 结构为：sth cost (sb)+钱；be worth +表示“金钱”的词，意思为“（某物）值多少钱”。函数的自变量x的取值范围是______．