Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone【B1】making mistakes. It is actually caused by【B2】of your "body clock"—a small cluster of brain cells that controls the timing of biological【B3】. The body clock is designed for a【B4】rhythm of daylight and darkness, so that it is thrown out of balance when it【B5】daylight and darkness at the "wrong" times in a new time zone. The【B6】of jetlag persist for days【B7】the internal body clock slowly adjusts to the new time zone. Now a new anti-jetlag system is【B8】that is based on proven【B9】pioneering scientific research. Dr. Martin Mooreede had【B10】a practical strategy to adjust the body clock much sooner to the new time zone through controlled exposure to bright light.
单选题
【B1】
【正确答案】
D
【答案解析】解析：词组be prone to (do)sth．为固定搭配，其含义是"有…的倾向，易于…"。如：This part of the road is prone to accidents．这段道路容易出事故．
【答案解析】解析：本句可译为"因跨越时区而导致的不适症状通常会持续数天"。D项symptoms"症状"最符合原文。首先，这种不适并不属于疾病的范畴，因此C项可以排除．A项sign意为"标志"，"迹象，征兆"。例如：There are no signs of life about the house．这房子没有有人住的迹象。B项defect通常指事物"固有的"、"先天的"缺陷。