28.We learn from the text that before 1805 .
A.The Rocky Mountains were wholly covered with snow
B.there were no people living in the western part of America
C.no Americans knew of the existence of the Rocky Mountains
D.the Appalachians were the western frontier of the United States
29.We learn from the text that the Lolo Pass .
A.has changed a lot since 1805B.is the meeting point of three cultures
C.remains much the same as it was 200 years agoD.now attracts a large number of tourists to visit
30.Judging from the text,Lewis and Clark were most probably .
A.two native IndiansB.explorers of the early 19th century
C.merchants who did business with the IndiansD.travelers whose curiosity took them over the Lolo Pass
31.We can infer from the text that when crossing the Lolo Pass the author .
A.was attempting the impossibleB.was trying to set a world record
C.was following the trail of Lewis and ClarkD.was fighting with weather and taking unnecessary risks
28-31 CCBC
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2019-11-15
2019-11-15
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2019-11-15