题目

从方框里选择合适的句子填空，完成对话。M: Mom, look at the kite. How high it is flying!W: (1) We can buy one over there. M: I don’t want to buy one. (2) Don’t you think DIY is a good idea?W: You’re right. But we need some materials. (3) M: Paper and sticks (棍子). Making a kite is a piece of cake.W: And how is it made? (4) M: Don’t worry. I can search for it on the Internet. I am always good at learning, right?W: I think so. I will prepare some paper and sticks for you. (5) M: Thank you, Mom. I’ll try my best. A. It’s easier said than done.B. I am sure you’l赤霉素是一类能促进细胞伸长，从而引起茎秆伸长和植株增高的植物激素。将纯种矮秆玉米用赤霉素处理后长成高秆玉米，这种高秆玉米自交后代的表现型为 [     ]A．后代100%为高秆B．后代100%为矮秆C．后代25%为高秆D．后代50%为矮秆