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【单选题】
Throughout the four years of college, Luke lived at home with his mother and commuted to college. He calculated the cost of commuting and compared it to the cost of living at college. The maths stated that living at home at the more economical choice. 13. Which do you think is the way of saving money according to the passage?A.
Living at home with parents.
B.
Living at college.
C.
Renting a house outside the college.
D.
Buying a small flat near the
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【简答题】种质资源的离体保存：是指对离体培养的小植株、器官、组织、细胞或原生质等材料，采用限制、延缓或停止其生长的处理使之保存，在需要时可重新恢复其生长，并（）的方法。
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