根据以下材料，回答题
In a telephone survey of more than 2,000adults,21% said they believed the sun revolved (旋转) around the earth. An 51 7% did not know which revolvedaround 52. I have no doubt that 53 all of these people were 54 inschool that the earth revolves around the sun: 55 may even have written it 56 a test. But they never 57 their incorrect mental models ofplanetary(行星的) 58 because their everydayobservations didn′t support 59 their teachers told them: People seethe sun "moving" 60 the sky as morning turns to night, and theearth seems stationary(静止的) 61 that ishappening.
Students can learn the right answers 62 heart in class, and yet never combinedthem 63 their working models of the world.The objectively correct answer the professor accepts and the 64 personal understanding of the world can 65 side by side, each unaffected bythe other.
Outside of class, the students like to seethe 66 model because it has always worked well 67 that circumstance. Unless professorsaddress 68 errors in students′ personal models of the world, studentsare not 69 to replace them with 70 one.
考查介词搭配。句意为“人们看到太阳越过天际，因此有了日夜更替”。能和sky搭配．并体现运动感的介词，选项中只有across。故选B。
我国保护少年儿童权益的专项法律是《中华人民共和国未成年人保护法》。（ ）
MP3（ ）。
计算机软件是指（ ）。
下面哪一项不属于维护交易安全原则的内容？（ ）
围绕《建国以来的重大科技成就》一课，做一个教案。
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在国际关系中，第三世界国家历来是中国团结合作的对象，因为 ①第三世界国家是国际社会一支重要的政治力量 ②团结第三世界国家符合中国的国家利益 ③合作是第三世界国家共同发展的必由之路 ④第三世界国家在南北关系中处于主导地位（ ）
微观经济学要解决的问题是（ ）
机关文书部门或业务部门在年终或第二年上半年对归卷的文件材料进行整理等工作，称为（ ）。
20世纪70年代中国外交有了重大突破和转机，转变的关键是（ ）
