【題目】關(guān)于經(jīng)線和緯線的敘述正確的是( 。

A.所有緯線長度相等B.緯度越高,緯線越長

C.經(jīng)線的形狀是圓D.經(jīng)線指示南北方向

【答案】D

【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。

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,故A錯誤。

緯度越高,緯線越短,故B錯誤。

經(jīng)線的形狀是半圓,故C錯誤。

經(jīng)線指示南北方向,故D正確。

故選:D

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