D．it is probably very expensive

　　答案：D　推理判断题。根据第二段第二句中“But using ambergris, which helps a perfume last longer...”以及倒数第三段中“But expensive perfumes are much more stable.”可知，含有龙涎香的香水价格昂贵，故D项正确；根据倒数第三段中“Their smell lasts much longer, for hours or even a day after you apply them.”可知，B项错误；根据第二段第二句中“is strongly opposed by many people who think it is wrong to kill whales...”可知，A项错误；C项文中未提及相关信息。

　　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

　　答案：B　词义猜测题。根据第四段中“There's a problem that many people wouldn't consider.”可知，该词组意为“有隐含的问题”，故B项正确。

　　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.

　　答案：A　细节理解题。根据第七段第二句中“it easily adopts new genes and changes its features and behaviour.”可知，由于酵母菌容易吸收其他基因，并将目的基因成功表达出来，故常被用于基因工程研究中，故A项正确。

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