湖南路大桥于今年5月1日竣工，为徒骇河景区增添了一道亮丽的风景线．某校数学兴趣小组用测量仪器测量该大桥的桥塔高度，在距桥塔AB底部50米的C处，测得桥塔顶部A的仰角为41.5°（如图）．已知测量仪器CD的高度为1米，则桥塔AB的高度约为（　　）（参考数据：sin41.5°≈0.663，cos41.5°≈0.749，tan41.5°≈0.885）

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根据短文理解完成下列各题。

    Denzil wasn't a very clever donkey. He always did some silly things because he didn't think. "Look out," the other donkeys said. "Here comes Denzil—everybody runs away!"

    One day, Denzil carried two heavy bags of salt, one on each side of his back. When he was crossing a big river, he fell into the water. The salt began to melt. When he tried his best to stand up, all the salt was gone. "Hey, that's really great," thought Denzil. "I must remember that. Next time I can do it again when I'm crossing a river."

    The next time he carried two bags of cotton(棉花). "Watch this, everybody," said Denzil when he and his friends got to the middle of the river. He went into the water and was gone! Nobody told him that cotton could get heavier in water. The other donkeys pulled him out at once and luckily he was still alive.

①肝脏  ②脾   ③肾脏  ④肺  ⑤胰腺．