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【題目】地球儀是學習地理的重要工具之一．讀地球儀圖，根據(jù)所學知識完成問題．

（1）在科普知識交流會上，小玲這樣描述地球的形狀和大小，你認為有誤的是（　�。�
A.地球是一個兩極稍扁赤道略鼓的不規(guī)則球體
B.地球表面積約5.1億平方千米
C.地球平均半經約6371千米
D.哥倫布環(huán)球航行首次證明地球是一個球體
（2）下列說法有誤的是（　�。�
A.m線是赤道，它的長度大約是4萬千米
B.n線是經線，它指示南北方向
C.a處為北極點，寫作90°N
D.R島位于低緯度地區(qū)
（3）圖中P點的經緯度是（　　）
A.30°W、30°S
B.30°
C.30°S
D.30°W、10°N
E.30°
F.30°N

【答案】
（1）D
（2）D
（3）D
【解析】（1）麥哲倫環(huán)球航行首次證明地球是一個球體．現(xiàn)在人們對地球的形狀已有了一個明確的認識：地球并不是一個正球體，而是一個兩極稍扁，赤道略鼓的不規(guī)則球體．經過測量，地球的極半徑為6357千米，赤道半徑為6378千米，地球的平均半徑為6371千米，地球表面積為5.1億平方千米，最大周長約4萬千米．故選：D．（2）讀圖分析可知： m線緯度為0°，是赤道，它的長度大約是4萬千米，故A正確；n線是經線，它指示南北方向，故B正確； a處為北極點，寫作90°N，故C正確；R島位于60°N﹣90°N之間，應屬于高緯度，故D錯誤；依據(jù)題意．故選：D．（3）在經緯網上，若相鄰兩條經線的經度向東增大，就是東經，用符號E表示，若相鄰兩條經線的經度向西增大，就是西經，用符號W表示；若相鄰兩條緯線的緯度向北增大，就是北緯，用符號N表示，若相鄰兩條緯線的緯度向南增大，就是南緯，用符號S表示．讀圖分析可知，圖中P點的經緯度是30°E，30°N；依據(jù)題意．故選：D．

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