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Questions 19 to 22 are based on the conversation you have just heard.
19.Where has the woman been?
【解析】[B]对话开头就给出了本题的答案。男士：How was your trip to Arizona?由此可见，女士刚刚从Arizona旅行回来。因此，选择B项。
20.What type of scientific discoveries does the woman mainly talk about?
【解析】[A]女士的话提到了：Not only the geologists, archaeologists have found the bones of extinct animals in caves and canyon walls.接着就主要说了考古学者在大峡谷的发现。
21.Where does the woman say the driftwood was found?
【解析】[A]本题亦可在对话中直接听出答案。女士说：In the cave 140 feet above the river, they found driftwood that dates back as far as 37,000 years. 因此，是在洞穴里发现漂流木的。
22.What would the man like to do someday?
【解析】[B]女士问：大峡谷充满了神秘，你以后会去亚利桑那州么?男士说：当然会去了。由此可见，男士也会去大峡谷游览。
