[求助]0501的阅读问题

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Questions 20-29
The Native American people of Oregon transported themselves and their goods on
foot, by canoe, by raft, by dog, and by horse. Each tribe used a combination of methods,
choosing the mode of transportation best suited to the terrain, the type of load, and the
Line desired speed. Since each band and local group had a different pattern of settlement and
5   easonal movement, the mixture of transportation methods differed from group to group
and from season to season.
Long-distance travel by foot was common all over Oregon. In rougher parts of the
inland valleys area and in eastern Oregon prior to the arrival of the horse (first introduced
to the area some 300 years ago), it was the principal mode of long-distance travel. Foot
10  trails wound across most mountain passes and were important in maintaining the vast
Native American trading network. Leather moccasins and Cute sandals were worn for long
hikes and for protection against cold, rather than for everyday use. In winter, snowshoes
were used for hunting expeditions, ID the Klamath area, where lakes were well stocked
with waterfowl and plant products, Native Americans used mudshoes (built similarly to
15  snowshoes) to keep from sinking in the mud.
Canoes and rafts were osed by Native Americans in all parts of Oregon, although they
were not a major method of travel in eastern Oregon. The boat* were used on lakes and
rivers for fishing, gathering water plants, bird hunting, and travel. Native Americans from
Oregon occasionally ventured to sea for seal hunts, but long sea voyages were much less
20  common than they were further north among the Nootka, Kwakiutl, and Halda people.
The use of canoes along the Columbia River contributed to the development of trading and continued, communication among neighboring tribes. Most Oregon canoes were made by hollowing logs. The wooden dugout was uniquely suited to western Oregon's plentiful supply
of timber. The canoes were expertly carved in a variety of shapes and sizes to
ensure a smooth and quiet voyage even in rough waters.
22. According to the passage, the horse
(A) could not be used for long distance travel
(B) replaced traveling by foot in more rugged areas
(C) Improved the quality of mountain foot trails
(D) was an important part of Oregon's culture

29. The passage most likely continues with a discussion of
(A) the process of seal hunting
(B) transportation by dog and horse
(C) winter transportation methods
(D) transportation outside of Oregon
这2题不会做，答案分别是B,D,可我怎么在文中找不到啊？我的答案是A,B.请问到底正确答案是什么？