【題目】假如有四個(gè)人同時(shí)從北極出發(fā),分別沿0°、90°E、90°W和180°四條經(jīng)線勻速前進(jìn),則()
A. 前進(jìn)的方向相同,在赤道處會合
B. 前進(jìn)的方向相同,在南極會合
C. 前進(jìn)的方向不相同,但在南極會合
D. 前進(jìn)的方向不相同,但在赤道會合
【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(gè)經(jīng)線圈;任何一個(gè)經(jīng)線圈都能把地球平分為兩個(gè)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(diǎn),進(jìn)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,指示南北方向。由此可判定,四人同時(shí)從北極出發(fā),分別沿0°、90°E、90°W和180°經(jīng)線勻速前進(jìn),那么他們前進(jìn)方向相同,都是向正南方向前進(jìn),在赤道上他們的距離最遠(yuǎn),都在南極點(diǎn)會合。依據(jù)題意。
故選:B。
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