The author mentions the ports of Los Angeles and Long Beach to ______.
［A］prove they are the largest ports in the United States
［B］demonstrate they create many new job opportunities
［C］highlight that shipping is less glamorous than making movies
［D］emphasize the role of shipping in southern California’s economy
正确答案：D
例句为原文第一段第二句因此需要到前边段首句找线索句子强调了航运业的重要性具有一定概括性因此以这两个港口作例子是具体说明这一点D选项直接表述了这一点AB选项就事论事说明这两个港口的重要性而不是它们所代表的行业整体的作用因此应该排除C选项与原文第一句观点相反
