题目内容：
There are blanks in the following passage. For each numbered blank, there are 4 choices marked A，B，C and D． Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.In a telephone survey of more than 2，000 adults，21% said they believed the sun revolved (旋转) around the earth. An 51 7% did not know which revolved around which I have no doubt that virtually all o f these people were 52 in school that the earth revolves around the sun they may even have written it 53 at est. But they never altered their incorrect mental models of planetary (行星的) motion because their every day observations didn't support 54 their teachers told them: People see the sun “moving 55 the sky as morning turns to night，and the earth seems stationary (静止的) 56 that is happening. Students can learn the right answers by heart in class，and yet never combined them 57 their working models of the worlD． The objectively correct answer the professor accepts and the student's personal understanding of the world Can exist side by side，each unaffected by the other.
Outside of class，the student continues to use the personal model be cause it has always worked well 58 that circumstance. Unless professors address specific errors in students' personal models of the world，students are not 59 to replace them with the 60 one.
A．excessive
B．extra
C．additional
D．added
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