【題目】成語“南轅北轍”指要到南方去,卻駕著車往北方走。比喻行動和目的地相反,最后不能達到目的地。如果是“東轅西轍”,理論上是可以達到目的地,其原因是
A.經(jīng)線等長,緯線不等長B.經(jīng)線是半圓,緯線是圓
C.地球不轉(zhuǎn)動D.地球自西向東公轉(zhuǎn)
【答案】B
【解析】
根據(jù)經(jīng)線是連接南北兩極并同緯線垂直相交的半圓,也稱子午線。經(jīng)線指示南北方向;所有經(jīng)線都呈半圓狀且長度相等;兩條正相對的經(jīng)線形成一個經(jīng)線圈;任何一個經(jīng)線圈都能把地球平分為兩個半球。緯線是在地球儀上,順著東西方向,環(huán)繞地球儀一周的圓圈。所有的緯線都相互平行,并與經(jīng)線垂直,緯線指示東西方向。緯線圈的大小不等,赤道為最大的緯線圈,從赤道向兩極緯線圈逐漸縮小,到南、北兩極縮小為點,進行分析解答。
經(jīng)線是連接南北兩極并同緯線垂直相交的半圓,也稱子午線。經(jīng)線指示南北方向;所有經(jīng)線都呈半圓狀且長度相等,故“南轅北轍”最后不能達到目的地;緯線是在地球儀上,順著東西方向,環(huán)繞地球儀一周的圓圈。所有的緯線都相互平行,并與經(jīng)線垂直,緯線指示東西方向,故如果是“東轅西轍”,理論上是可以達到目的地。結合題意。故選:B。
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