[单选题]病毒性肝炎腹水产生的原因，以下哪一项是不存在的？(　　)
A. 肝细胞合成白蛋白减少
B.低钠血症
C.门静脉高压
D.肝内静脉窦充血和压力增高
E.醛固酮增加

High school and college students in the United States today, as well as others who plan to work in this country, have one important question about their futures: Will they find a job There’s no easy answer, of course. But let’s look at some of the recent changes in the U.S. job market and see if we can make some predictions for future job hunters.
A. good way to begin is to look at the American work force and how it’s changing. Clearly, the most important change has been the shift from a manufacturing economy to a service economy. Let’s define both of these terms. First, a service economy is one in which most workers provide services--that is they do something instead of making something. They don’t produce a specific product; they serve customers or clients, like your doctor does, or your hair stylist, or airline pilots, salesclerks, etc. Now, in contrast, people who actually produce things -- like cars, furniture or clothing--are part of t