题目

五、词与短语填空 alone probably unusual succeed help out lonelyalone probably unusual succeed help out lonely 【1】You will certainly _______in your experiment unless you give it up.【2】A lot of old people are________.【3】It's _______ for him to get up early because he is always late.【4】Van Gogh is _________ the best-known painter in the world.【5】Tony, could you please_______with a few things?用A4纸复印文件，在甲复印店不管一次复印多少页，每页收费0.1元．在乙复印店复印同样的文件，一次复印页数不超过20时，每页收费0.12元；一次复印页数超过20时，超过部分每页收费0.09元．设在同一家复印店一次复印文件的页数为x(x为非负整数)．(1)根据题意，填写下表：一次复印页数(页)5102030…甲复印店收费(元)0.5　 　2　 　…乙复印店收费(元)0.6　 　2.4　 　…(2)设在甲复印店复印收费y1元，在乙复印店复印收费y2元，分别写出y1，y2关于x的函数关系式；(3)当x＞70时，顾客在哪家复印店复印花费少？请说明理由．