题目

设θ∈(0,2π),若sinθ＜0且cos2θ＜0,则θ的取值范围是___________.        答案：＜θ＜       解析:∵θ∈（0,2π）,sinθ＜0,       ∴π＜θ＜2π.       ∵2θ∈（0,4π）,cos2θ＜0,       ∴＜2θ＜＜2θ＜.       ∴ 用括号中所给单词的适当形式填空1.I think it’s a good (choose) to spend holiday in Haina in winter.2.It’s not easy to make money， so we should use our money (wise).3.The writer has (publish) many books these years.4.The girl speaks little， she is a good (listen).5.I saw Jack (enter) the teacher’s office just now.