Most people who travel long distances complain of jetlag. Jetlag makes bus

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问题    Most people who travel long distances 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 re- search. Dr. Martin Moore-Ede has【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 light 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. [br] 【C9】

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

答案 C

解析 tentative意为“试探(性)的，试验(性)的”，例如：Only when you go through the mental exercises to come up with a tentative definition，should you open the dictionary to see if you’re right.只有当你经历了这些心理活动从而得出一个不确定的定义后，你才应该打开词典看看你是否正确。 broad作“宽的，阔的，广阔的；广泛的，宽容的”讲，例如：Look at the

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