题目

39. There are hurricanes here frequently in summer. The underlined part means _____. A. often                   B. recently               C. sometimes            D. Seldom 答案：A4．对于③和④两条虚线的判断，正确的是（　　）A．③表示山谷B．③表示山脊C．④表示山谷D．③、④均表示山脊