单选题 Questions 12 to 15 are based on the conversation you have just heard.
【正确答案】 B
【答案解析】[听力原文]
M: It"s good to see you back. How was your trip to Arizona? Did you see the Grand Canyon?
W: Yes, it was fantastic. Now I know why it is listed together with the Nile River as one of the great natural wonders of the world. Here, want to see the pictures I took?
M: Oh, what a view! It is even bigger than I had imagined. I remember reading about the Grand Canyon and I think it said that it was formed suddenly when the earth"s crust was split open during an earthquake.
W: Well, not that quickly. Look, here is the picture of the Colorado River. See way down at the bottom of the canyon, that river and its branches have been wearing the canyon floor away for ten million years.
M: Then the canyon is the result of soil erosion. I"ll bet geologists have made some interesting discoveries there.
W: Not only the geologists, archaeologists have found the bones of extinct animals in caves in the canyon walls. In a cave one hundred and forty feet above the river, they found driftwood that dates back as far as thirty seven thousand years.
M: That means the river must have been a hundred and forty feet higher up when it carried the drift wood into the cave.
W: It"s very possible, but of course, who knows. The Grand Canyon is full of mysteries. Wouldn"t you like to go to Arizona some day?
M: You bet I would.

Where has the woman been?

[解析] 男士在对话开头就问道:“很高兴看到你回来。你的亚利桑那之行怎么样?”可见女士是去了亚利桑那州。故选B。
【正确答案】 A
【答案解析】[听力原文]
What type of scientific discoveries does the woman mainly talk about?

[解析] 本题问女士主要讨论了哪一学科的研究发现。对话中男士提到:“对于大峡谷,地理学家应该有很多有趣的发现。”女士回答道:“不仅是地理学家,考古学家在大峡谷的岩壁上也发现了已灭绝动物的骨骼。”故选A。
【正确答案】 A
【答案解析】[听力原文]
Where does the woman say the driftwood was found?

[解析] 本题问浮木是在什么地方被发现的。女士提到,在高于河面140英尺的一个洞穴中,考古学家发现了有37000年历史的浮木。故选A。
【正确答案】 B
【答案解析】[听力原文]
What would the man like to do some day?

[解析] 本题问男士未来某一天要做什么事,答案线索在对话结尾处。女士问:“你不想有一天到亚利桑那州去看看吗?”男士回答:“You bet I would. (我肯定会去。)”可见他会去亚利桑那州看大峡谷,短语you bet意为“的确,一定”。故选B。选项A未提及,C和D太过具体,在对话中找不到依据。