文章大意:本文是一篇科普说明文。介绍了一种使香水香味持久的物质——龙涎香,因这一物质来自于鲸,所以遭到人们的反对。科学家们发现一些树中的化学物质可以用来取代它,他们利用酵母菌成功制造出了这些化学物质。
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.
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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