题目

  Dear Mum and Dad, Tomorrow is my birthday．It means I am 1 8 years old and become an  a        ．Now I'm writing to you                       76．            to  e        my thanks and I'd like to tell you about my                        77．            future plan．You've made great         （努力 ）to bring                  78．            me up．It is you      first gave me encouragement when I                   79.      �下列物质中氮元素的化合价由低到高的顺序排列一组是（　　）A．N2O3、NH3、NO、N2B．NH3、N2、NO、N2O3C．NH3、NO、N2、N2O3D．NO、N2、N2O3、NH3