已知g（x）=|x-1|-|x-2|，则g（x）的值域为______；若关于x的不等式g（x）≥a²+a+1（x∈R）的解集为空集，则实数a的取值范围是______．

Just at the corner of the street _________, more than half of which date back to at least 100 years ago.  [      ]

A. stand some old shops                

B. do some old shops stand   

C. some old shops stand                

D. some old shops do stand