题目

根据短文内容，将所给的词的恰当形式填入填在横线上。Once upon a time, a man (1) __________ (see) a sliver bird (银鸟). He took it home. He (2) __________ (like) the bird very much. A woman (3) __________ (tell) the man about a gold bird (金鸟). Then, the man didn’t (4) __________ (look) at his silver bird.One day, the silver bird (5) __________ (become) a gold bird. But it flew away.计算（每小题7分，共14分）（1）(2a) 3·b4÷12a3b2      （2） (3x-1)(2x+3)-6x2