______，Marcia walked up to the podium and deliverer an animated acceptance speech．

A．New York is the first city using smartphones for taxi services in the U
S．
B．Similiar cases have been reported in some other European countries．
C．Passengers can use mobil apps to call taxi and make payment in N
Y．

A．He is the author of The Sky at Night．
B．He devoted himse to the study of the universe．
C．He was a former presenter of the BBC．