路基冬期施工前应进行的准备工作包括（）。
A．编制冬期施工项目实施性施工组织设计
B．冬期施工项目在冰冻前应进行现场放样，保护好控制桩井，树立明显的标志，防止被冰雪掩埋
C．冰冻前应挖好坡地上填方的台阶，清除石方挖方的表面覆盖层
D．冬期施工的路堤填料，应选用冻结好的砂类土，碎、卵石土，开挖石方的石块等材料
E．维修保养冬期施工需用的车辆、机具设备等
参考答案：A, B, C, D
A farmer had a cow. (奶牛) He 36 very good care of this cow and one day when it was ill. He was very 37 . He telephoned the vet（兽医）. “What’s the problem?”the vet 38 him when he arrived. “My cow is ill,”the farmer said.“I don’t know what’s the matter 39 her. She’s lying down and won’t 40 up. She won’t eat, and she’s making a strange 41 .” The vet looked at the cow. “She’s certainly ill.” he said, “and she needs to take some very strong 42 .” He took a bottle out of his box, and put two pills into his 43 . “Give her these,” he said. “The pills should make her 44 .” “ 45 should I give them to her?” the farmer asked. The vet gave him a 46 tube（管子）. “Put this 47 in her mouth, ”he said,“then put the pills 48 the tube and blow( 吹). That’ll make it.” The vet went away. The next day he came to the 49 again. The farmer was sitting outside his house and looked 50 . “How’s your cow?”the vet asked. “No change,”the 51 said. “and I’m feeling very well myself.” “Oh?”the vet said.“ 52 .” “I did 53 you said,”the farmer answered.“I put the tube in the cow’s mouth and then put two 54 in it.” “And?”the vet asked. “The cow 55 first,”the farmer said.
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