【題目】地球儀是學(xué)習(xí)地理的重要工具之一.讀地球儀圖,根據(jù)所學(xué)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(rèn)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(jīng)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(jīng)線,它指示南北方向
C.a處為北極點(diǎn),寫作90°N
D.R島位于低緯度地區(qū)
(3)圖中P點(diǎn)的經(jīng)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(rèn)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(jīng)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(jīng)線,它指示南北方向,故B正確; a處為北極點(diǎn),寫作90°N,故C正確;R島位于60°N﹣90°N之間,應(yīng)屬于高緯度,故D錯誤;依據(jù)題意.故選:D.(3)在經(jīng)緯網(wǎng)上,若相鄰兩條經(jīng)線的經(jīng)度向東增大,就是東經(jīng),用符號E表示,若相鄰兩條經(jīng)線的經(jīng)度向西增大,就是西經(jīng),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(diǎn)的經(jīng)緯度是30°E,30°N;依據(jù)題意.故選:D.

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