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更多“21, 20, 18, 15, 11 , ___”相关的问题
A.19
B.19.5
C.20
D.20.5
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 a-round the sun;【5】may even have written it【6】a 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 thern: 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】models 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.
(1)
A．excessive
B．extra
C．additional
D．added
根据各地城市道路建设的经验，对于双车道多用()m，四车道用()m，六车道用()m。
A．8.0～8.5；16～18；19～21
B．7.5～8.5；15～16；20～22
C．7.0～7.5；14～16；20～23
D．7.5～8.0；13～15；19～22
