求一般位置线段实长的常用方法有（）法、（）法、（）法和（）法等。
参考答案：直角三角形、直角梯形、旋转、换面
小题1:Li Lei often practises ____ (read) English. So his English is better than any other students in our class.
小题2:It was raining hard, so it ____ (take) them three hours to get to the picnic.
小题3:--What we you going to be when you grow up?
--I want to be a ____ (write).
小题4:Look! There ____ (be) a pen and two books on the desk.
小题5:The people in the north of China usually eat some ____ (dumpling) on New Year’s Eve.
在城市规划区内新建、扩建和改建建筑物、构筑物和其他工程设施，必须先取得( )。
A．建设工程规划许可证
B．房屋所有权证
C．开工许可证
D．土地开发权证书
