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 disruption of your "body clock"—a small cluster of brain cells that controls the timing of biological【C2】______ . The body clock is designed for a regular rhythm of daylight and darkness, so that it is thrown out of balance when it【C3】______ daylight and darkness at the "wrong" times in a new time zone. The【C4】______ of jetlag of ten persist for days while the internal body clock slowly adjusts to the new time zone.
    Now a new anti-jetlag system is【C5】______ that is based on proven【C6】______ pioneering scientific research. Dr. Martin Mooreede had devised a practical strategy to adjust the body clock much sooner to the new time zone【C7】______ controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates【C8】______ of the discomfort of jetlag.
    A successful time zone shift depends on knowing the exact times to either【C9】______ or avoid bright light. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule for light exposure depends a great deal on【C10】______ travel plans.
【C6】

选项 A、extensive
B、tentative
C、broad
D、inclusive

答案B

解析 C项broad侧重“宽阔的,概括的”,D项inclusive意为“包括的”,用来修饰pioneering scientific research显然都不合适,所以可以排除C项和D项。A项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项tentative“试探的,实验性的”和上下文最贴切。
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