2017届重庆市高考英语一轮复习阅读理解选编精练：104（含解析）_高考复习指南

　　Being difficult to hold

　　B. having a hidden problem

　　needing further testing

　　D. being too similar

　　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.

　　B. He made his discovery during Christmas.

　　C. He has worked in the perfume industry for many years.

　　D. He has previously done genetic esearch.

　　语篇解读

　　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。

　　D 推理判断题。根据第二段第二句以及倒数第三段可知，含有龙涎香的香水价格昂贵，故D项正确。

　　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“，故选B项正确。

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