单选题
Australia began to assume its modern
configuration
by the Eocene Epoch, some 50 million years ago, when Antarctica broke away and drifted southward.
【正确答案】
C
【答案解析】解析：本题中，configuration的意思是“外形”。C项的shape“外形”符合题意，如：A huge shape loomed up through the fog．(一个巨大的影像在雾中隐约出现。)其他三项status “地位”，sphere“球”， situation“情况”都不正确。