时差 北京时间的4月9日中午12时是美国时间的几日几时

下图中AB、CD为两条纬线，B、C、E位于同一经线上，A、E、D三点的太阳高度为0°，A和E的时差与E和D的时差之比为2：1。读图后，完成。

小题1:若E点地方时为5 时，则

A．A点比C点的昼长差不可能达12小时

B．B点不可能出现极昼

C．C点白昼不少于9小时

D．D点一定昼短夜长

小题2:若D、E之间的时差为4小时，则
A．E点位于北半球或南半球
B．C点刚好出现极昼或极夜
C．B点比A点早日出或早日落8小时
D．B点与D点的昼长或夜长均相差12小时
小题3:当A点的太阳高度达一天中最大值，此时北京时间为15时整，6小时后D点将迎来日出，则

A．C点与E点的昼长之比为3：2	B．E点与C点的正午太阳高度之比小于1
C．地球上不同日期范围之比为4：1	D．AED的经度范围与全球经度之比为5：12

If you have ever experienced jet lag(飞行时差反应)，you know how much of a drag it can be. Jet lag happens as a result of air travel, when traveling between two or more time zones. Your body is used to operating in a certain time zone, and when its timing is affected, you’re likely to have problems.
Edward Norton’s character in the movies Fight Club faces the struggle of jet-lag-induced sleeplessness due to his constant traveling. Sleeplessness is just one of the effects of jet lag, and it can lead to other problems, such as tiredness, memory loss and confusion. That’s not something you should have to fight on a business trip and it certainly won’t make your vacation very enjoyable, either.
Sleeplessness is the biggest problem for travelers that suffer from jet lag. Don’t worry. You can do something to prevent it.
Modify(改变)Your Body Clock
To prevent the effects on your body’s timing that come with crossing time zones, you need to change your body clock sooner, rather than later. You can do this by putting yourself on the same time as your destination time zone before you fly. If you know that you will be traveling to London from the eastern United States, you’ll have a five-hour time difference to deal with. Plan for it.
Avoid Heavy Food and Alcohol(酒精)
Part of the pleasure of flying commercially, especially if you fly business or first class, is taking advantages of the food and drinks. If you want to avoid jet lag, though, you should think twice. Eating heavy food will only make the jet lag worse. It isn’t good to drink alcohol during a flight, either, because it may make you drowsy. Wait until your body adjusts(调整) before you decide to have heavy food or drink alcohol.
小题1:
What is the main idea of the passage?

A．What jet lag is and the effects it has.

B．What jet lag is and the movies about it.

C．How jet lag happens and how to fight it.

D．How jet lag happens and tips on traveling safely.

小题2:
Norton’s character in Fight Club has to fight with .

A．confusion	B．sleeplessness
C．heavy drinking	D．memory loss

小题3:
The underlined word “drowsy” probably means “ ”.

A．worried

B．shocked

C．sleepy

D．excited

小题4:
According to the passage, in order to prevent jet lag, you should .

A．sleep for the whole flight	B．drink little alcohol
C．not fly business class	D．know your destination well

小题5:
The passage is most likely taken from .

A．a travel magazine	B．an entertainment report
C．a geography magazine	D．a fashion website