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Jet lag is back on the agenda for business travelers, especially as long-haul international traffic picks up again.

There is endless advice online about jet lag. Drugs are frequently mentioned, and a recent favorite is Nuvigil, used to treat excessive sleepiness. Nuvigil’s manufacturer, Cephablon, has so far not succeeded in obtaining government approval for its plan to market the drug as a remedy forjet lag.

But the approach I hear most often from long-haul travelers involves diet and preparation. " Why would you take a pill that your body then has to shake off " said Lynne Waller Scanlon, the author, with Charles F. Ehret, of Overcoming Jet Lag, which was a best seller in the mid-1980s but went out of print until she revised and republished it last year under a snappier title, The Cure for Jet Lag.

The book lays out a treatment system for jet lag based on pre-trip diet and conditioning to reset the body’s internal clock. The book suggests resetting the body clock so that it will be in sync with the time at the destination. One to three days before a trip, the authors suggest low-calorie meals. In flight, avoid or strictly limit alcohol, and use coffee or tea to persuade the body clock that it’s daytime. If it’s morning after flying all night, resist sleep and " flood your eyes with daylight " , they suggest.

While all long-haul travel can cause normal fatigue, travel across time zones causes the body to react with the most pronounced effects of jet lag, including disorientation and a general sense of discomfort.

In the last few years, the global airlines have put more emphasis on accommodating the need for in-flight sleep—at least in the business and first—class cabins, where international airlines earn most of their revenue. But at the same time, international airlines also promote extensive in-flight entertainment selections, as well as high-end menus, including quality wine lists, in premium classes. Indulging in these would seem to work against dietary treatment to combat jet lag. But Ms. Scanlon says recovery is nevertheless attainable.

" What do you do if you can’t implement this program ahead of the trip, or if you’ve blown it and had a complete debauch on the plane " she said, " Well, when you get off that plane, you get on the program right away. It may not be perfect, but you will feel much, much better.

The word " snappier " (Para.3)most probably means（）

A. longer

B. more elegant

C. smarter

D. prettier

车辆的拖挂能力利用程度可用（）之比来计算。

A.挂车数量与汽车数量

B.挂车完成周转量与汽车完成周转量

C.拖挂运行工作车日与工作车日

D.挂车完成周转量与汽车加挂车完成的总周转量

安全生产责任制就是各级领导、工程技术人员在劳动生产过程中负责的制度。

在我国领域和管辖的其他海域内建设对环境有影响的建设项目都应进行环境影响评价，环境影响评价必须遵守污染物排放的国家标准和地方标准，采取措施治理与该项目有关的环境污染和生态破坏，并根据建设项目对环境的影响程度，对建设项目的环境保护实行分类管理，即分（）。

A.环境影响报告书

B.环境影响报告表

C.环境影响评价书

D.环境影响评价表

E.环境影响登记表

根据下面的资料，回答问题：
Z公司2010年全年实现销售收入2000万元，其中净利润200万元，该公司2010年末拥有总资产12000万元，总负债5000万元。

Z公司2010年的财务杠杆为( )。

A．0.7
B．1.4
C．1.7
D．2.4