填空题

A lot of people think that sitting is (36) on their backs than standing or lifting. Not true. People whose jobs require them to sit for long periods of time (37) as much from back pain as people who lift all day long. Many world-class researchers believe that the huge (38) in back pain over the past couple of (39) —and it is huge--has a lot to do with the fact that more and more of us are spending our work days in chairs. Many people have the (40) that, if their back pain gets bad enough, they can always resort to (41) . Nothing could be further from the truth. The amount of pain someone is in has very little to do with whether or not he or she could (42) from surgery. One British researcher has (43) that for every 10,000 people who experience about back pain, only four need surgery. (44) . No longer. Two or three days of bed-rest is now the norm. After that, people are advised to return to their normal activities, gradually if necessary. The reasons for the 180° shift are what’s interesting. For openers, (45) . In our next lecture, we shall look at the relation between depression and chronic back pain. (46) .