Hana Highway, Hawaii

　This journey might only be 32 miles long, but given that this includes more than 600 curves in the road and 54 (mostly one-lane) bridges, the stretch between Twin Falls and Hana in Hawaii is something of an adventure.

Blue Ridge Parkway, USA

　Winding through America's Blue Ridge Parkway during the fall months is surely one of the most dramatic experiences road travelers can have.

　The foliage makes for a visual feast: reds, yellows and oranges cloak the surrounding landscape as you travel down through Virginia and North Carolina.

21. How many thrilling roads mentioned in the text are in the USA?

　　A. one. B. two. C. three. D. four.

22. In which road may you meet Brown bear during the road trip?

　　A. Icefield Parkway, Canada. B. Hana Highway, Hawaii.

　　C. Blue Ridge Parkway, USA. D. Route 66, America.

23. When is the best time to visit Blue Ridge Parkway, USA?

　　A. January. B. March. C. August. D. September.

24. The passage is most likely to be taken from _______.

　　A. Website. B. Newspaper.

　　C. A travel brochure. D. A book review.

Compared to other crows, those from the Pacific island of New Caledonia, located east of Australia, are master toolmakers and users, second only to humans and on a level with chimps when it comes to finding novel uses for everyday objects. In their natural forest environment, the midnight black birds shape twigs(细枝), leaves and even their own feathers into tools for rooting out insects in dead wood.

The crows create tools to specific needs. They examine a problem and then pick or design a decent tool. For example, faced with a snack hidden in a small tree hole, a crow will cut and adjust a leafy oak branch to just the right width to dig the hole.

Scientists have found that crows living on different parts of the island show variations in tool shapes. A discovery suggests that young crows learn to make tools in a particular way from relatives and other crows living nearby. If so, it would mean the birds possess a culture of tool technology like that of humans.

To test this idea, researchers at the University of Oxford in the U. K. hand-raised four New Caledonian crows---two received lessons in tool use from their human foster parents, while the other two did not. Despite their different upbringings, all four young birds used sticks to get food form crevices(裂缝), proving that crow have a native ability for tool use. However, Uek and Nalik, the two birds schooled in toolmaking, carried and inserted twigs into crevices faster and more often than Oiseau and Corbeau, the two innocent crow.

The researchers suggest that recognition gained from studying crows could be applied to humans to help understand how tool use evolved in our own species.

25. What skill of crows is specially stressed in the passage?

　　A. Seeking food sources. B. Copying human activities.

　　C. Making full use of tools. D. Changing the surrounding environment.

26. What does the underlined work "decent" in Paragraph 2 mean?

　　A. Sharp. B. Precious. C. Delicate. D. Appropriate.

27. What can we infer from the research by the University of Oxford?

A. Crows can be easily raised and taught by humans.