Questions 19 to 21 are based on the conversation you have just heard.
19. What is the conversation mainly about?
【解析】选。选项都是一些总结性的词句表明该题可能就对话的主旨或大意提问。由对话开头就提到的some questions about the new official standard weight that you purchased可判断该对话是围绕新的标准测重砝码展开的,故选。和都是针对对话中it was made of poor quality metal that was too porous ― it absorbed too much moisture设的干扰项。在对话中没有涉及。
20. How is the weight used?
【解析】选。选项表明该题可能考查某一个事物的用途或作用。中的atmosphere与选项中多次提到的scale,metal,weight等词关系不大,故可初步排除。由对话中Dr. Thomas的回答... use it to check the scales all over the country可直接得出答案是。是根据对话中的higher quality metal设的干扰项。
21. What does Doctor Thomas probably think about the cost of the new weight?
【解析】选。选项表明该题是就某物是否值许多钱提问。 和的观点完全相反,持中立态度,说该事物拥有的重要功能来说是很合理的,看问题全面、客观,这样的选项往往是答案。当对话中女士对该工具是否值那么多钱提出疑问时,Dr. Thomas的回答是Im sure it is,而后又举了药品工业的例子说明标准测量砝码的重要功能,故正确。Conversation Two
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