题目

发射通讯卫星的火箭上发生的化学反应：2N2H4 +N2O43N2+4X其中X的化学式是 A．N2O      B．NO      C．NO2     D．H2O 答案：DCell phones are now widely used,  _______possible for us to talk to anyone from almost anywhereA.make itB.to make itC.makingD.making it