题目

—Shall we go to the market to get some apples？ —Look！It ______rain.Let’s make it another time. A.will           B.is going to        C.would              D.shall   答案：B根据迹象预测将会发生某事时，用be going to。  下列函数①y=－x；②y=2x＋11；③；④中，是一次函数的有 [　　] A．4个B．3个C．2个D．1个