某建筑层高3.5m，室内消火栓系统采用SN65的消火栓，水龙带长度为25m，若水带弯曲折减系数为0.7，水枪充实水柱长度为10m，则消火栓的保护半径为( )。
A．20m
B．22.5m
C．21.0m
D．26m
参考答案：C
解析： 根据《建筑给水排水工程》(第5版)第67页的公式(3-2-2)，消火栓的保护半径应为
R＝(0.7×25+3.5)m＝21.0m。
完形填空（10分） I think the best place to go on Sunday is the zoo. When you are 1 , you can go there with your family. 2 the zoo, there are many animals: elephants, deer, 3 , rabbits and other animals. Elephants are the 4 animals on land. I 5 that there is a baby elephant in our zoo. So I want to 6 at it. Yu Xuan wants to go with me. She says, " 7 we go there together?" "Sure!" I say. "We can 8 a good time there. But let's 9 there at half past four. I have 10 homework to do."
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