31 This passage is mainly aboutA the human growth hormone. B the effects of al

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问题

31 This passage is mainly about

选项 A the human growth hormone.
B the effects of altering cells.
C insulin resistance.
D U.S. Supreme Court rulings.

答案B

解析从第一段尤其是前三句中我们可以了解到，遗传工程就是对细胞进行改造，而后面列举的三种重要的医疗产品正是细胞改造的成果，因此B项可以概括短文的内容，其他三个选项均不恰当。

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