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一、选择题1 .2的倒数是 ( ) .A .-2 B .2 C .-12 D .122 .第五次全国人口普查结果显示 ,我国的总人口已达到 1 3 0 0 0 0 0 0 0 0人 ,用科学记数法表示这个数 ,正确的是 ( ) .A .1 .3× 1 0 8 B .1 .3× 1 0 9C .0 .1 3× 1 0 10 D .1 3× 1 0 93 .
1. The reciprocal of multiple choice question 1.2 is () .A .-2 B .2 C .-12 D .122 . The results of the fifth national census show that the total population of China has reached 1 3 0 0 0 0 0 0 0 people, using scientific notation to indicate this number, the correct one is () .A .1 .3× 1 0 8 B .1 .3× 1 0 9C .0 .1 3× 1 0 10 D .1 3×1 0 93 .