答案 C
39.What's the best title for this passage?
A.Great advancement in cloning goats
B.Difficulties in saving extinct animals
C.Public concerns about cloning
D.Cloning brought back an extinct species for a while
解析 主旨大意题。通读全文,可知科学家们克隆了一只已经灭绝的比利牛斯野生山羊,但这只羊在出生不久就死了,故D项最适合作文章标题。
答案 D
B
We each have a unique genetic(基因的,遗传的) makeup. Every cell of your body has the same set of about 100,000 separate genes made of DNA.These are the instructions for producing a person. Genes decide everything from the colour of your skin to the way your brain works. You have one of several billion combinations of DNA which come from the random mixing of your parents' genes. Except for identical twins(同卵双胞胎), no one has the same combination as another person. You are unique! You are unique in another way too: in the way you are raised and all the experiences you have from before birth to adult life. These experiences influence you, your behaviour and attitudes, and the choices you make.
But are genes or life experiences more important in shaping your appearance and personality? Scientists are studying twins to find out. One set of twins occurs every 70 births—some are identical and others are nonidentical twins. Identical twins are special because they share exactly the same genes and often the same environment. Nonidentical twins are more like ordinary brothers and sisters.
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