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

　　.

　　Being difficult to hold

　　B. having a hidden problem

　　C.

　　needing further testing

　　D. being too similar

　　3.

　　According to the passage, why are yeast cells often used in genetic research?

　　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.

　　4. What can we learn about Joerg Bohlmann from the passage?

　　A. He is opposed to whale hunting.

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