Most people who travel long distances complain of jetlag(喷气飞行时差反应).Jetlag makes business travelers less productive and more prone ___1___ making mistakes. It is actually caused by ___ 2 ___ of your “body clock” - a small cluster of brain cells that controls the timing of biological ___3___ .The body clock is designed for a ___4___ rhythm of daylight and darkness, so that it is thrown out of balance when it ___ 5___ daylight and darkness at the“wrong”times in a new time zone. The ___ 6___ of jetlag often persist for days ___7___ the internal body clock slowly adjusts to the new time zone.

Now a new anti - jetlag system is ___8___ that is based on proven ___ 9___ pioneering scientific research. Dr. Martin Moore-Ede has ___10___ a practical strategy to adjust the body clock much sooner to the new time zone ___11___ controlled exposure to bright light, The time zone shift is easy to accomplish and eliminates ___12___ of the discomfort of jetlag.

A successful time zone shift depends on knowing the exact time to either ___13___ or avoid bright light. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule ___14___ light exposure depends a great deal on ___15___travel plans. Data on a specific flight itinerary (旅行路线)and the individuals sleep ___16 ___are used to produce a Trip Guide with ___17___ on exactly when to be exposed to bright light.

When the Trip Guide calls ___18___ bright light you should spend time outdoors if possible. If it is dark out - side, or the weather is bad, ___19___ you are on an aeroplane, you can use a special light device to provide the necessary light ___ 20___ for a range of activities such as reading, watching TV or working.

1. A) for B)from C)to D) of
2. A) rupture B) corruption C) eruption D) disruptio
3. A) actions B) functions C) reflection D) behavior
4. A) regular B) formal C) continual D) circular
5. A) retains B) encounters C) possesses D) experiences
6. A) diseases B) symptoms C) signs D) defects
7. A) while B) whereas C) if D) although
8. A) adaptable B) approachable C) available D) agreeable
9. A) broad B) inclusive C) tentative D) extensive
10. A) devised B) recognized C) scrutinized D) visualized
11. A) at B) through C) in D) as
12. A) most B) least C) little D) more
13. A) attain B) shed C) retrieve D) seek
14. A)on B)with C)for D) in
15. A) unique B) specific C) complicated D)peculiar
16. A) norm B) mode C) pattern D) style
17. A) directories B) instructions C) specifications D) commentaries
18. A)off B)on C)for D) up
19. A)or B)and C) but D) while
20. A) agitation B)spur C) acceleration D) stimulus

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1.[C] prone to 是固定搭配，意为“易于……的；有……之倾向的”，后接名词或动词，也可接不定式。

2.[D]disruption（分裂，腐烂，腐化，断绝，混乱，失衡），rupture（破裂；绝交）， corruption（腐败，腐烂，败坏）， eruption（火山爆发，战争/疾病爆发）

3.{B}functions（机能，功能）

4.[A]regular（定期的，规则的）；formal(正式的，形式的)

5.[D]experiences（经历）；encounter（遇到，遭遇）常指遭遇到新奇的或不希望发生的食物。文中昼夜是必然发生的自然现象，故用encounter不妥。retain（保持，保留）；Possess（拥有，占有）

6.[B]symptoms（症候，征候）；disease(疾病)；defect（缺陷）

7.[A]while

8.[C]available（可利用的，可获得的）；adaptable(可适应的，可改编的)； approachable（可接近的，可到达的）； agreeable（惬意的，令人愉快的）

9.[D]extensive(广泛的)

10.[A]devised（设计，想出）；recognize（认出，识别）； scrutinize（详查）； visualize（想像，设想）

11.[B]through作为介词，可表示作用、方法、工具或原因。

12.[A]most此处为代词，“大部分”。

13.[D]seek（寻找，探求，试图），文中用or连接，表示该词与“avoid” 的意思相反。

14.[C]for schedule for 是习惯搭配。

15.[B]specific（具体的，明确的；特有的）；unique（唯一的）；peculiar（特殊的，古怪的）； compplicated（错综复杂的，麻烦的）。

16.[C]pattern(指某事发生或发展的“方式，模式”)；mode（做事，说话或行为的“方式，方法”，样式）；norm（标准，规范）； style（风格，文体）。

17.[B]instructions（指导；说明）；directory（电话簿）；specification（规格，说明书；规范）；commentary（评语，注解，说明）

18.[C]for call for(需要，需求)；call on/at（访问，拜访）；call off（取消）； call up（召集；打电话；使人想起）。

19.[A]or

20.[D]stimulus（鼓励，激励，刺激）；spur(马刺；刺激)，但该词着重于“使……更”的意思，放在此处不合适。agitation（激动，搅拌）； acceleration（加速，加速度）。