精选优质文档-倾情为你奉上精选400句托福阅读长难句(OG & TPO)第一类1. The same thing happens to this day, though on a smaller scale, wherever a sediment-laden river or stream emerges from a mountain valley onto relatively flat land, dropping its load as the current slows: the water usually spreads out fanwise, depositing the sediment in the form of a smooth, fan-shaped slope.2. In lowland country almost any spot on the ground may overlie what was once the bed of a river that has since become buried by soil; if
