unit1-unit6

1.2.3 相反数 知识点1 相反数的概念 知识提要：只有符号不同的两个数叫做互为相反数． －1的相反数是1． 1．2 017的相反数是(B) A．2 017                    B．－2 017 C...

 

 

 

1．—Annie’s voice is so beautiful.—Yes. She is born with the ________ to sing.A．head B．ability C．pride D．courage2．—________ do you make so many friends?—________ helpi...