基础地质条件变化不大的地段，砌石路基的伸缩缝间距一般应约为______。
A．6～10m
B．10～15m
C．15～20m
D．20～30m
参考答案：C
解析： 砌石路基顶宽0.8m，基底面以1:5向内倾斜，砌石高度为2～15m。砌石路基应每隔15～20m设伸缩缝一道。当基础地质条件变化时，应分段砌筑，并设沉降缝。地基为整体岩石时，可将地基做成台阶形。
It is evening．An old cock（公鸡） is sitting in a tall tree．A fox（狐狸） comes to the tree and at the cock．“Hello, Mr．Cock．I have some news（信息） for you．”says the fox．“Oh?” says the cock．“What is it?” “All the animals are good friends now．Let’s friends, too．Please come and play with me．”“Fine!” says the cock．“I’m very glad to hear that”．Then he looks up．“Look! There is something over there．”“ are you looking at?” asks the fox．“Oh，I see some animals over there．They’re this way．”“Animals?” “Yes．Oh，they’re dogs．”“What? Dogs!” asks the fox．“Well…well，I go now．Goodbye．”“Wait，Mr．Fox，”says the cock．“ go．They are only dogs．And dogs are our friends now．”“Yes，I know，but don’t know that．”“I see，I see，”says the cock．He and goes to sleep in the tree．Do you know why? Foxes are afraid(怕) of dogs．
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