—Beijing is one of     __    in the world today.               

—So it is.           [ ]

A. big cities                          

B. the biggest city            

C. bigger cities                      

D. the biggest cities

现在你安静地坐在考场里答题，如果说你是静止，选择的参照物是：[ ]

A．来回走动的监考员

B．从窗外飞过的小鸟

C．从窗外走过的巡视员

D．黑板前的讲台桌