At the beginning of this century, medical scientists made an interesting discovery; we are built not just of flesh and blood but also of time. They were to show that we all have “a body clock” us, which controls the and fall of our body energies, us different from one day to the next. The of “a body clock” should not be too since the lives of most living things are controlled the 24 hour night-and-day cycle. We feel and fall asleep at night and become and energetic during the day. If the 24 hour-cycle is , most people experience unpleasant . For example, people who are not to working at night can find that of sleep causes them to badly at work. the daily cycle of sleeping and , we also have other cycles which longer than one day. Most of us would that we feel good on some days and not so good on ; sometimes our ideas seem to flow and at other times, they do not exist. 小题1: A．anxious B．able C．careful D．proud 小题2: A．inside B．around C．between D．on 小题3: A．movement B．supply C．use D．rise 小题4: A．showing B．treating C．making D．changing 小题5: A．invention B．opinion C．story D．idea 小题6: A．difficult B．exciting C．surprising D．interesting 小题7: A．from B．by C．over D．during 小题8: A．dull B．tired C．dreamy D．peaceful 小题9: A．regular B．excited C．lively D．clear 小题10: A．disturbed B．shortened C．reset D．troubled 小题11: A．moments B．feelings C．senses D．effects 小题12: A．prevented B．allowed C．expected D．used 小题13: A．miss B．none C．lack D．need 小题14: A．perform B．show C．manage D．control 小题15: A．With B．As well as C．Except D．Rather than 小题16: A．working B．moving C．living D．waking 小题17: A．repeat B．remain C．last D．happen 小题18: A．agree B．believe C．realize D．allow 小题19: A．other B．the other C．all other D．others 小题20: A．just B．only C．still D．yet