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  3. What does the word "bogus" (Line 2) most probably mean? The South Korean team’s breakthrough in cloning is that

What does the word "bogus" (Line 2) most probably mean? The South Korean team’s breakthrough in cloning is that

admin2014-09-19  20
问题 What does the word "bogus" (Line 2) most probably mean?
The South Korean team’s breakthrough in cloning is that
选项 A、they have really created an embryo
B、they have developed women’s body cells into blastocysts
C、they have cultivated blastocysts with fixed features
D、they have been able to grow tissues containing stem cells
答案D
解析 细节题。此题需要认真阅读文章中有关韩国的克隆研究内容部分。从第二段中部开始，我们得知，韩国科学家从志愿的妇女身体上取得卵细胞，去除其中的核子，代之以该志愿者的体细胞中取出的核子。通过化学的方法，被重新置人体细胞核子的卵细胞开始分裂，就好像是以传统的方式．“授精”了一样。(由此可知B明显不对。)然后研究小组将分裂的卵细胞进行培养直到它们形成一种叫blastocyst的结构，这种结构此时只是没有任何面貌身体特点的细胞球(C与这点不符合，所以不对)，但开始分化形成身体所需的三种基本细胞。因此研究人员可以从blastocyst结构中提取细胞，培养成含有这三种细胞的组织。这些干细胞可以通过培养形成各种用于构建器官的特殊细胞。通过以上分析可知，D是正确答案。
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