首先是通读全文。第一遍通读，其目的是总结出意群的大意并由此而把握文章的脉络。文章的开头写道：Most people who travel long distances complain of jetlag．这就是文章的主题句。它说明了本文所叙述的内容，一定是与时差反应有关的，多半是讲述如何克服时差反应的。我们在通读文章时，对于文章的第一句一定要加以注意，因为完型填空的第一句一般是不命题的，其目的就是要我们比较容易地掌握文章的主旨。
Jetlag makes business travelers less productive and more prone ___61___ making mistakes．It is actually caused by ___62___ of your “body clock”----a small cluster of brain cells that controls the timing of biological ___63___．The body clock is designed for a ___64___ rhythm of daylight and darkness，so that it is thrown out of balance when it ___65___ daylight and darkness at the“wrong“times in a new time zone．The ___66___ of jetlag often persists for days ___67___ the internal body clock slowly adjusts to the new time zone．这是第一个意群，它的主要意思就是说生 物钟造成了时差反应。我们可以将这一段话概括为“生物钟-时差“。Now a new anti-jetlag system is ___68___ that is based on proven ___69___ pioneering scientific research．Dr Martin Moore—Ede had ___70___ a practical strategy to adjust the body clock much sooner to t
