B.Improve our stress resistance.(提高我们的抗压能力。)文中并未说明提高抗压能力是生物钟系统完善身体机能的关键。D.Train our alertness purposefully..(有目的地训练我们的警觉性。)文中只提及生物钟系统会通过释放警觉性荷尔蒙实现身体机能的完善并未说明训练和提高警觉性会使得生物钟系统作用良好。30.D。推断。根据第四段However,.our society loves an early bird,,so you may have beensurrounded by advice to start your day earlier...contribute to improved mental clarity andheightened concentration,ultimately setting the stage for a more successful workday ahead.知,有证据表明早起的人效率更高、更高产。3l.A。理解主旨要义。根据最后-一段“If you need to change your sleep schedule to fit yourlifestyle better,remember to change by no more than 15 minutes each day and regard it as astep-by-step task.”以及全文可知,作者从确保充足睡眠、规律作息、循序渐进适当早起等方面进行分析和说明,帮助我们解锁早起诀窍。D【主题语境】人与自然一灾害防范【语篇导读】本文是一篇说明文。由于全球范围内的气候变化,森林野火火灾呈上升态势。为了应对这个问题,德国公司Dyad开发了一种新型的野火预警系统,这种预警系统通过气体检测传感器及时发出警报,帮助森林管理者尽快采取行动,有效遏制火情的蔓延。【语块积累】?濠?訛wildfire野火?凝?訛give out散发?譻?訛visual detection视觉检测?警?訛satellite imaging卫星成像?譽?訛detection time探测时间