某种家用电器的进价为800元，出售的价格为1 200元，后来由于该电器积压，为了

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

汞量法测定青霉素钠的含量，被测物与滴定液的摩尔比

A．1:1
B．1:2
C．1:3
D．2:1
E．3:1

慢性宫颈炎的典型临床表现是

A．外阴瘙痒

B．白带增多

C．外阴疼痛

D．外阴灼热感

E．外阴湿疹

下列属于政府采购的对象范围的有（）。

A.采购办公用品

B.采购工程

C.对办公楼进行改扩建

D.租赁固定资产

危险物主要指具有：（）。

A.毒害性

B.爆炸性

C.易燃性

D.腐蚀性