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  3. According to the text, stem cells are hard to obtain because _____. According to the passage, the key factor in avoiding reject

According to the text, stem cells are hard to obtain because _____. According to the passage, the key factor in avoiding reject

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问题 According to the text, stem cells are hard to obtain because _____.
According to the passage, the key factor in avoiding rejection after transplantation is to _____.
选项 A、make DNAs that are very small and have immune systems.
B、make DNAs that are as strong as antibiotics and vaccines.
C、make DNAs that are identical with those in the patients’ cells.
D、make DNAs that are consistent with the ACT research results.
答案C
解析 细节题。文章第五段最后一句说"由于这样制成的细胞含有的DNA和病人细胞DNA的相同，所以可以避免移植后的排异反应"。由此可见避免排异反应的关键在于制造出与病人细胞内DNA相同的细胞。
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考研英语一

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