Questions 19 to 21 are based on the conversation you have just heard.
19. What is the conversation mainly about?
【解析】选[A]。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[A]。[B]和[C]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。[D]在对话中没有涉及。
20. How is the weight used?
【解析】选[B]。选项表明该题可能考查某一个事物的用途或作用。[C]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[B]。[D]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[D]。选项表明该题是就某物是否值许多钱提问。[A] 和[C]的观点完全相反,[B]持中立态度,[D]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[D]正确。Conversation Two
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