[单选题]血钠浓度降低而细胞外液减少见于(　　)
A.高渗性脱水
B.低渗性脱水
C.等渗性脱水
D.水中毒
E.水肿

{{B}}The Paper Chase{{/B}}
"Running a house is a lot like running a business," says Stephanie Denton, a professional organizer based in Cincinnati, Ohio, who specializes in both residential and commercial paperwork and record keeping. To get a successful grip on organizing documents, bills, and other materials, Denton suggests the following tips.
Create a space in which you can always do your paperwork. This is perhaps the most important element of a successful system. If you can’t devote an entire desk to the task, at least invest in a rolling file cart to store active paperwork and a two-drawer file cabinet for family records. Store the rolling file cart wherever it is most convenient and comfortable to do your work, whether that is the kitchen, office, or family room.
When in doubt, throw it out. The first step to