九年级英语周报2018答案

短文改错The other day, I as well as my parents were eatingesmurant when we noticed a foreigner coming in. He seatsseatedhimself at a table by the window. Soon a waitame and wanted to take her order. However, the foreigner couldnt gothis needs across. Seeing this, I went upie to offer some helps. We communicated with simple Englis( fo(a whilebut I later knew why the waitress koutan't anderstand him. The foreigner actually wanted A roast Beiing duck, but he hadalsolaughed

6.A【解析】不等式组所表示的可行域为如图所示的△ABC及其内部令2x,所表示的直线如图中虚线所示,平移该直线,当经过点C(2,2)时,z取得最大值6.故正确答案为A2x-y=2C y=2OBx+y

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