BCBB
1.推理題:從文章第一段的In the 19th century, Americans from the eastern states moved out west to settle in the rich new lands along the Pacific Coast.可知他們是想在西部安家.選 B
2.推理題:從文章第二段的句子:The western desert can be very dangerous. There is little water and there are few trees. But the desert also has scenery of great beauty.說明答案是 C
3.從第四段的句子:In the 1800s, many travelers died when they tried to cross this waterless valley in the terrible heat.可知他們因為酷熱而死.答案是B
4.細節(jié)題:從最后一段的句子:Snakes and rats have learned how to live in the desert heat. They live underground and come out at night, when it is cool.看出如果不會打洞,動物就會死.選B