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Factory farming could soon enter a new era of mass production．Companies in the US are developing the technology needed to“clone”

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问题 Factory farming could soon enter a new era of mass production．Companies in the US are developing the technology needed to“clone”chickens on a massive scale Once a chicken with desirable traits has been bred or genetically engineered，tens of thousands of e
The technology of freezing stem cells from different strains of chicken can do all the following EXCEPT that_________．
选项 A、farmers can order certain strains of c,hicken 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
答案A
解析 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。
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