题目

已知sinα=,α∈(0,π),则tanα的值等于（    ）A.              B.                C.±                D.± 答案：解析：由sinα=,α∈(0,π),∴cosα=±,∴tanα=±.答案：D.After staying in room for weeks, the lady was advised to go to the outside world to _____ her confidence as well as health.A．take upB．make upC．carry upD．pick up