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  3. Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone 【C1】____

Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone 【C1】____

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问题     Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone 【C1】______ making mistakes. It is actually caused by 【C2】______ of your"body clock"—a small cluster of brain cells that controls the timing of biological【C3】______. The body clock is designed for a【C4】______rhythm of daylight and darkness, so that it is thrown out of balance when it 【C5】______ daylight and darkness at the "wrong" times in a new time zone. The【C6】______of jetlag often persist for days【C7】______the internal body clock slowly adjusts to the new time zone.
    Now a new anti-jetlag system is【C8】______that is based on proven【C9】______pioneering scientific research. Dr. Martin Moore Ede had【C10】______a practical strategy to adjust the body clock much sooner to the new time zone【C11】______controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates【C12】______of the discomfort of jetlag.
    A successful time zone shift depends on knowing the exact times to either【C13】______or avoid bright light. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule【C14】______light exposure depends a great deal on【C15】______travel plans.
    Data on a specific flight itinerary and the individual’ s sleep【C16】______are used to produce a Trip Guide with【C17】______on exactly when to be exposed to bright light.
    When the Trip Guide calls【C18】______bright light you should spend time outdoors if possible. If it is dark outside, or the weather is bad,【C19】______you are on an aeroplane, you can use a special light device to provide the necessary light【C20】______for a range of activities such as reading, watching TV or working.
【C9】
选项 A、extensive
B、tentative
C、broad
D、inclusive
答案B
解析 考查形容词辨析。首先可以排除C项和D项。因为broad侧重“宽阔的”，“概括的”，inclusive意为“包括的”，用来修饰pioneering scientific research显然都不合适。此外，extensive意为“广泛的，大量的”，显然和文中所给出的pioneering“前卫的，创新的”不符合。因此只有B．tentative“试探的，实验性的”和上下文最贴切，为正确答案。
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