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Problem Description The twenty-first century is a biology-technology developing century. We know that a gene is made of DNA. The nucleotide bases from 阅读全文
posted @ 2018-07-30 00:34
Xenny
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Problem Description Last night, little erriyue had a horrible nightmare. He dreamed that he and his girl friend were trapped in a big maze separately. 阅读全文
posted @ 2018-07-30 00:07
Xenny
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