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　　Mrs. Green is the mother of two children. She is a shop assistant(店员). She is very busy every day. Every morning, she cooks breakfast for her family. She cooks eggs for her daughter and makes bread for her son. At noon she eats hamburgers in her shop. Her children have lunch in the school dining hall.

    In the evening, Mrs. Green gets home very late. When she gets home, her children get ready for dinner. Mr. Green cooks beef noodles for his daughter and cooks carrots for his son. And Mrs. Green usually buys some chicken from the supermarket. It's Mrs. Green's favourite food.

我国的返回式卫星将一些种子带上太空，让种子中的遗传物质发生改变，从而培育出新品种．对新品种与原品种差异的最准确表述是（　　）

根据所给单词的正确形式完成句子

70×600=____  25×16=____  700÷25=____