写一写．
（1）2009年我国生产原油146000000吨，把横线上的数改写成用“亿”作单位的数，再保留一位小数．
（2）人类的遗传物质DNA是很长的链，最短的22号染色体也长达30000000个核苷酸，把横线上的数改写成以“万”为单位的数．
（1）146000000吨=1.46亿吨≈1.5亿吨；
（2）30000000=3000万；
故答案为：1.46亿，1.5亿，3000万．
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| A young officer (军官) was at railway station. He was on his 1 to visit his mother in another town, and he wanted to 2 her to tell her the time of his 3 , so that she could meet him at the station 4 her car. He looked in all his pockets but found that he did not have the right money for the telephone, so he went outside and looked 5 for someone to 6 him. At last an old soldier came by, and the young officer stopped him and said, "Have you 7 change (零钱) for ten pence?" " 8 ," the old soldier answered, and put his hand into his pocket. "I'll see whether I can help you." "Don't you know 9 to speak to an officer?" The young man said angrily. "Now 10 start again. Have you got change for ten pence?" "No, sir!" The old soldier answered angrily. | ||||
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