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

　　A．its user probably supports whale hunting

　　B．its smell will last for about an hour

　　C．there will be a whale symbol on the bottle

　　D．it is probably very expensive

　　17．The underlined expression “with a catch” in Paragraph 3 means ________.

　　A．being difficult to hold

　　B．having a hidden problem

　　C．needing further testing

　　D．being too similar

　　18．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.

　　19．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.

　　20．What is the best title for the passage?

　　A．The Christmas tree's secret.

　　B．The sweet smell of success.

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