题目内容
人类进入农业社会以后，就停止了进化。（）
查看答案
搜索结果不匹配？点我反馈
更多问题
Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.In a telephone survey of more than 2,000 adults,21% said they believed the sun revolved (旋转)around the earth. An 1 7% did not know which revolved around 2 . I have no doubt that 3 all of these people were 4 in school that the earth revolves around the sun; 5 may even have written it 6 at test. But they never 7 their incorrect mental models of planetary (行星的) 8 because their every day observations didn’t support 9 their teachers told them: People see the sun moving 10 the sky as morning turns to night,and the earth seems stationary (静止的) 11 that is happening. Students can learn the right answers 12 heart in class,and yet never combined them 13 their working models of the world. The objectively correct answer the professor accepts and the 14 personal understanding of the world can 15 side by side,each unaffected by the other. Outside of class,the student continues to use the 16 model because it has always worked well 17 that circumstance. Unless professors address 18 errors in students’ personal models of the world,students are not 19 to replace them with the 20 one.
____ __是以建筑物和构筑物为对象的多工种交叉、轮替、顺序进行的生产活动。大部分是露天作业,容易受到天气和场地的影响,且经常处于高空和地下,如果不妥当加以防护,容易发生坠落、磕碰、坍塌、触电、火灾等事故,造成生命和财产损失。建筑工地发生的事故按伤害类型可分为高处坠落、物体打击等等。( )
____ __是指物体在外力和重力的作用下,超过自身极限强度的破坏力,结构失衡塌落而造成物体高处坠落,物体打击、挤压伤害及窒息等事故( )
____ __在起重作业中,吊载、吊具等重物从空中坠落所造成的人身伤亡和设备毁坏的事故。( )
微信支付 
支付宝支付