A.We cannot easily change our physical appearance.
B.How we turn out depends on our parents' genes.
C.Everyone has a physical double somewhere in the world.
D.Both our genes and our experiences make us who we are.
解析 主旨大意题。第一段主要介绍人的特殊性的两个原因:一个是遗传基因,一个是生活经历。
答案 D
41. Why are scientists studying twins?
A.To find out how many twins are born every year.
B.To discover what shapes us as individuals.
C.To compare differences between twins.
D.To study brotherandsister relationships.
解析 细节理解题。根据第二段第一、二句可知,科学家正在研究双胞胎,是为了弄清楚到底是遗传基因还是生活经历在塑造人的外貌和性格上起着更重要的作用。
答案 B
42. According to the passage,________.
A.one in 70 twins are genetically identical
B.nonidentical twins are usually not of the same sex
C.twins separated at birth behave exactly the same
D.identical twins are genetically the same
解析 细节理解题。根据第一段中的“Except for identical twins (同卵双胞胎),no one has the same combination as another person.”可知,同卵双胞胎的基因是相同的。
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