A．They can take on the characteristics of other genes.

　　B．They can reproduce much faster than other cells.

　　C．They share some of the qualities of plant genes.

　　D．They're much cheaper to use than ambergris.

　　解析：细节理解题。根据第七段“Biologists like to work with yeast because it easily adopts new genes and changes its features and behaviour.”可知因为它们能呈现出其他基因的特征故选A。What can we learn about Joerg Bohlmann from the passage?

　　A．He is opposed to whale hunting.

　　B．He made his discovery during Christmas.

　　C．He has worked in the perfume industry for many years.

　　D．He has previously done genetic research.

　　解析：细节理解题。根据文章内容可知Bohlmann以前做过基因研究工作故选D。What is the best title for the passage?

　　A．The Christmas tree's secret.

　　B．The sweet smell of success.

　　C．Whale­free perfume.

　　D．Save the whale.

　　解析：主旨归纳题。根据全文的内容可知这个研究成果的运用可不再需要从鲸里提取龙涎香制作香水C。to be young again.She quickly replied，“Wish to be young again? No，for I have learned too much to lose if I am a far6.________(value)person today than I was 30 years ago，or 20 years ago，or 15，10 or even 5.I have learnt so much 7.________I was 70.”

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