若代数式+有意义，则实数x的取值范围是（　　）                          

A．x≠1                        B．x≥0                         C．x≠0                        D．x≥0且x≠1

答案

D【考点】二次根式有意义的条件；分式有意义的条件．                                

【分析】先根据分式及二次根式有意义的条件列出关于x的不等式组，求出x的取值范围即可．              

【解答】解：∵代数式+有意义，                                               

∴，                                                                                  

解得x≥0且x≠1．                                                                              

故选D．                                                                                            

【点评】本题考查的是二次根式及分式有意义的条件，熟知二次根式具有非负性是解答此题的关键．