题目内容

【题目】成语“南辕北辙”指要到南方去,却驾着车往北方走。比喻行动和目的地相反,最后不能达到目的地。如果是“东辕西辙”,理论上是可以达到目的地,其原因是

A.经线等长,纬线不等长B.经线是半圆,纬线是圆

C.地球不转动D.地球自西向东公转

【答案】B

【解析】

根据经线是连接南北两极并同纬线垂直相交的半圆,也称子午线。经线指示南北方向;所有经线都呈半圆状且长度相等;两条正相对的经线形成一个经线圈;任何一个经线圈都能把地球平分为两个半球。纬线是在地球仪上,顺着东西方向,环绕地球仪一周的圆圈。所有的纬线都相互平行,并与经线垂直,纬线指示东西方向。纬线圈的大小不等,赤道为最大的纬线圈,从赤道向两极纬线圈逐渐缩小,到南、北两极缩小为点,进行分析解答。

经线是连接南北两极并同纬线垂直相交的半圆,也称子午线。经线指示南北方向;所有经线都呈半圆状且长度相等,故“南辕北辙”最后不能达到目的地;纬线是在地球仪上,顺着东西方向,环绕地球仪一周的圆圈。所有的纬线都相互平行,并与经线垂直,纬线指示东西方向,故如果是“东辕西辙”,理论上是可以达到目的地。结合题意。故选:B

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