一个合数的因数[ ]
A．只有2个
B．只有3个
C．有3个或3个以上
答案：C
若（a+2）x|a|-1-2yb+2=3是关于x、y的二元一次方程，则b-a=______．
—Hello! _____ Mr. Green?
—Yes, this is Mr. Green. Please speak.[ ]
A. Is he
B. Are you
C. Is this
D. Is that
