The technology of freezing stem cells from differ
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The technology of freezing stem cells from different strains of chicken can do all the following EXCEPT that______.
A. farmers can order certain strains of chicken only
B. Origen can supply all the strains of chicken the market might need
C. chicken farmers order certain strains of chicken for economic reasons
D. chicken farmers can be supplied with whatever strain they need
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答案：A
第六段的大意是，如果能冷冻所有品种的鸡的干细胞，那么，无论需要什么品种的鸡蛋或多少数量，都不是问题。但是，目前储备所有品种是非常昂贵的。B、C、D从几个方面表达了这层意思。因此，只有A是答案。