Yeast may sound familiar because it's used to make things like bread, wine and beer. Biologists like to work tith yeast because it easily adopts new genes and changes its features and behavior. When Bohlmann put the fir tree into the yeast, the yeast started making the same chemical that had seen produced by the tree.

　　Perfumers pay big money for ambergris because it is a fixative, which means it holds a smell in place on a person's body.

　　“Cheap perfumes smell good in the first hour or so and then everything it gone.” explains Bohlmann. “But expensive perfumes are much more stable. Their smell lasts much longer, for hours or even a day after you apply them.”

　　The new chemical, made from the tree genes, can be used as a fixative, too. And using yeast to make it is far cheaper than acquiring ambergris.

　　Bohlmann admits he never thought he'd get into the perfume business. But now, he says, producers have been calling to find out how to use his technology in mew perfumes.

　　It can be inferred from the passage that if a perfume contains ambergris,

　　.

　　Its user probably supports whale hunting

　　Its smell will last for about an hour

　　There will be a whale symbol on hour

　　It is probably very expensive

　　The underlined expression “with a catch” in Paragrph 3 means

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