题目

已知P(sinα-cosα，tanα)在第一象限，则在［0,2π］内α的取值范围是(    )A.( ，)∪(π,)                         B.( ，)∪(π, )C.( ，)∪(,)                       D.( , )∪(,π) 答案：解析：P(sinα-cosα,tanα)在第一象限，则即∴α∈(，)∪(π，).答案:BLucy likes playing ________ ping-pong, but her sister Lily likes playing ______ guitar.A．／; ／B．the; ／C．the; theD．／; the