選擇正確。南非是世界最大鉆石出口國(guó)。South Africa is the world's biggest exporter of raw diamonds.

不對(duì)。Ruby（紅寶石） is not found in South Africa.

不對(duì)。藍(lán)寶石（Sapphire） is not found in South Africa.

不對(duì)。Emerald（綠寶石） is not found in South Africa.

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