黄石市2016高考英语一轮阅读理解和书面表达选练（1）及答案_高考复习指南

　　of British Columbia in Canada. But his discovery of a new plant gene (基因) might push whales

　　out of the perfume business.

　　The gene comes from fir trees, found throughout North America and commonly used as

　　Christmas trees.

　　The trees produce a chemical that can be used in perfume in place of

　　ambergris—but with_a_catch.

　　“There's a problem that many people wouldn't consider. In the tree, the chemical is mixed

　　with many others. That makes separation a challenge，” Bohlmann says. “It's like trying to isolate

　　sugar from a biscuit.”

　　This is where science becomes useful. When Bohlmann learned that fir trees produce the

　　ambergrislike chemical, he decided to use his gene knowhow to find the instructions for how to

　　make the ambergrissubstitute.

　　Bohlmann found that gene and took it out of the tree cells. Then he did something that might

　　sound strange to someone who doesn't work in genetics: Bohlmann put the gene from the tree

　　into yeast (酵母) cells.

　　Yeast may sound familiar because it's used to make things like bread, wine and beer.

　　Biologists like to work with yeast because it easily adopts new genes and changes its features and

　　behaviour. When Bohlmann put the fir tree gene into the yeast, the yeast started making the

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