题目

用方框中所给单词的适当形式填空，使对话通顺、正确。每词仅用一次。 piecetooth addsugarspoon A:It's hot today.B:Yes, it is really hot. I want to eat ice-cream.A:I think it is bad for your .B:But 1 really want to eat something cool.A:What about eating tomatoes with ? I can make it.B:Good! What do we need?A:Three tomatoes and five of sugar.B:OK ... I'm coming. What should we do first?A:Wash the tomatoes and cut them into .B:What's next?A:Put them on a plate and the sugar.B:Is that all?A:Yes. You can enjoy them now.已知变量x、y满足约束条件，则z=3x+2y的最大值为（ ）A．-3B．C．-5D．4