【題目】讀“陸半球地圖”，回答問題。

(1)A大洲居民以________人種為主。

(2)從發(fā)展水平看，B大洲大多為____________國(guó)家。

(3)七大洲中，“陸半球地圖”沒有顯示的大洲有大洋洲和_________。

(4)簡(jiǎn)述C大洲地勢(shì)與河流的關(guān)系_________。

(5)在某次軍事演練活動(dòng)中，彼得船長(zhǎng)駕船從D點(diǎn)依次向正北、正東、正南、正西各行駛了500千米后，發(fā)現(xiàn)只能回到D點(diǎn)的正東面。請(qǐng)用地理知識(shí)向彼得船長(zhǎng)解釋不能回到D點(diǎn)的原因：______。

【答案】(1)白色 (2)發(fā)展中(3)南極洲(4)地勢(shì)中部高，四周低，導(dǎo)致河流從中部呈放射狀流向四周(5)經(jīng)線等長(zhǎng)，緯線不等長(zhǎng)。(或：經(jīng)線等長(zhǎng)，緯線長(zhǎng)度從赤道向兩極遞減。)

【解析】（1）讀圖可知，A是歐洲，主要人種是白種人。

（2）讀圖可知，B是非洲，由于長(zhǎng)期的殖民統(tǒng)治，非洲國(guó)家都是發(fā)展中國(guó)家。

（3）七大洲中，“陸半球地圖”A是歐洲，B是非洲，C是亞洲，還有北美洲和南美洲的大部分，沒有顯示的大洲有大洋洲和南極洲。

（4）讀圖可知，C是亞洲，亞洲是世界上面積最大的大洲，地勢(shì)特點(diǎn)是中部高，四周低。導(dǎo)致河流從中部呈放射狀流向四周。

（5）經(jīng)線指示南北方向，緯線指示東西方向，由于經(jīng)線等長(zhǎng)，緯線的長(zhǎng)度不相等。所以不能回到出發(fā)點(diǎn)。

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