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【单选题】
从《中华人民共和国2010年国民经济和社会发展统计报告》中获悉，去年我国国内生产总值达397983亿元．请你以亿元为单位用科学记数法表示去年我国的国内生产总值为（结果保留两个有效数字）（ ）A.
3.9×10 13
B.
4.0×10 13
C.
3.9×10 5
D.
4.0×10 5
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