北京奥运游泳场馆“水立方”是世界上唯一一个完全由膜结构来进行全封闭的大型公共建筑，它采用的ETFE膜，只有一张牛皮纸厚，捧在手上轻若鸿毛；它可以被拉伸到自身的三到四倍也不会断裂；它的耐火性、耐热性也非常出色；此外，即便是冰雹撞击薄膜的巨响也不能传递到场馆之内。这种建筑材料不具备的特点有[ ]
A．密度小
B．分子间无斥力
C．熔点高
D．隔音性较强
答案：B
“Maggie, come here please.” called Grandpa. “I went to the town and had a ____ for you.” Grandpa was standing next to a big __＿. “Grandpa,” Maggie called. “Is that my surprise? What is it?” she asked ____. “open it up and find it by yourself” Grandpa said． Maggie opened the box. “It’s a puppy,” Maggie said. She picked up a small, brown ____ With big ears． “Oh, Grandpa. I ____ him. He should have a ____. Let me think! Spot? Rover? No, they are not cute.” Maggie said. The puppy ____ to dig (挖) a hole in the ground. “Grandpa, I’m going to ____ him Digger. He likes to dig,” Maggie smiled “That’s ____. But make sure that he doesn’t dig my flowers up,” Grandpa said and went back to the house. That night Maggie fell asleep with ____ lying next to her. What a wonderful surprise to get a little dog!
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