Transgenic mammals that secrete monoclonals in their milk can generate one gram of antibody for roughly $100—one third the price

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问题 Transgenic mammals that secrete monoclonals in their milk can generate one gram of antibody for roughly $100—one third the price of traditional production methods, most scientists agree, but still too expensive to be ______ .

选项 A、revolutionary
B、efficient
C、cost-effective
D、regarded
E、feasible

答案C

解析
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