Most people who travel long distance
complain of jetlag. Jetlag makes business travelers less productive and more
prone{{U}} (31) {{/U}}making mistakes. It is actually caused by{{U}}
(32) {{/U}}of your "body clock"—a small cluster of brain cells that
controls the timing of biological{{U}} (33) {{/U}}. The body clock is
designed for a{{U}} (34) {{/U}}rhythm of daylight and darkness, so that
it is thrown out of balance when it{{U}} (35) {{/U}}daylight and
darkness at the "wrong" times in a new time zone. The{{U}} (36) {{/U}}of
jetlag persist for days{{U}} (37) {{/U}}the internal body clock slowly
adjusts to the new time zone. Now a new anti-jetlag system is{{U}}
(38) {{/U}}that is based on proven{{U}} (39) {{/U}}.pioneering
scientific research. Dr. Martin Mooreede had{{U}} (40) {{/U}}a practical
strategy to adjust the body clock much sooner to the new time zone through
controlled exposure to bright light.
【正确答案】
D
【答案解析】[注释] 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】[注释] 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。