In a telephone survey of more than 2，000 adults，21% said they believed the sun revolved (旋轉(zhuǎn))around the earth. An 71 7% did not know which revolved around 72. I have no doubt that 73 all of these people were 74 in school that the earth revolves around the sun； 75 may even have written it 76 at test. But they never 77 their incorrect mental models of planetary (行星的) 78 because their every day observations didn’t support 79 their teachers told them: People see the sun moving 80 the sky as morning turns to night，and the earth seems stationary (靜止的) 81 that is happening. Students can learn the right answers 82 heart in class，and yet never combined them 83 their working models of the world. The objectively correct answer the professor accepts and the 84 personal understanding of the world can 85 side by side，each unaffected by the other.

　　Outside of class，the student continues to use the 86 model because it has always worked well 87 that circumstance. Unless professors address 88 errors in students’ personal models of the world，students are not 89 to replace them with the 90 one.

71.A.excessive B. extraC. additionalD. added

72.A.what B. whichC. thatD. other

73.A.virtually B. remarkablyC. ideallyD. preferably

74.A.learned B. suggestedC. taughtD. advised

75.A.those B. theseC. whoD. they

76.A.on B. withC. underD. for

77.A.formed B. alteredC. believedD. thought

78.A.operation B. positionC. motionD. location

79.A.how B. whichC. thatD. what

80.A.around B. acrossC. onD. above

81.A.since B. soC. whileD. for

82.A.to B. byC. inD. with

83.A.with B. intoC. toD. along

84.A.adult’s B. teacher’sC. scientist’sD. student’s

85.A.exist B. occurC. surviveD. maintain

86.A.private B. individualC. personalD. own

87.A.in B. withC. onD. for

88.A.general B. naturalC. similarD. specific

89.A.obliged B. likelyC. probableD. partial

90.A.perfectB. betterC. reasonableD. correct