91. Arid regions in the southwestern United States have become increasingly inviting playgrounds for the growing number of recreation seekers who own vehicles such as motorcycles or powered trail bikes and indulge in hill-climbing contests or in caving new trails in the desert.91.美国西部的不毛之...
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Then they are going to travel on camels 62 the Sahara Desert 63 they can see beautiful stars on clear nights. About a week 64 (late), they are going to travel down the River Nile and go white-water rafting 65 (wear) a helmet and a life jacket. After that they will go to Kenya ...