因工作需要穿越铁路时，可以爬车或钻车。

急性胰腺炎患者禁食时每天应补液多少毫升（）。

A.1000ml

B.1500ml

C.2000ml

D.1500～2000ml

E.2000～3000ml

下列说法正确的是（　　）

A．可能性很大的事件一定发生

B．可能性很小的事件不可能发生

C．冬天里，我国的哈尔滨经常会下雪

D．无选项

D

Let’s do some sleep math．You lost two hours of sleep every night last week because of a big project due on Friday．On Saturday and Sunday，you slept in，getting four extra hours．On Monday morning，you were feeling so bright—eyed that you only had one cup of coffee，instead of your usual two．But don’t be cheated by your energy．You’re still carrying around a heavy load of sleepiness，or what experts call “sleep debt”一in this case something like six hours，almost a full night’s sleep．

Sleep debt is the difference between the amount of sleep you should be getting and the amount you actually get．It’s a shortage that grows every time we skim some extra minutes off our nightly sleep．“People get more sleep debt gradually without being noticed，”says William C．Dement，founder of the Stanford University Sleep Clinic．Studies show that such short term sleep lack leads to a foggy brain，worsened vision，and trouble remembering．Long-term effects include obesity(肥胖)，insulin(胰岛素)resistance，and heart disease．A survey by the National Sleep Foundation reports that we’re losing one hour of sleep each night——more than two full weeks of sleep every year．

The good news is that，like all debt，with some work，sleep debt can be repaid．Adding all extra hour or two of sleep a night is the way to catch up．For the long-term lack of sleep， take it easy for a few months to get back into a natural sleep pattern．

Go to bed when you are tired，and allow your body to wake you in the morning(no alarm clock allowed)．You may find yourself catatonic(有紧张症的)in the beginning of the recovery cycle：expect to have ten hours shut—eye per night；As the days pass，however，the amount of sleeping time will gradually decrease．

So earn back that lost sleep and follow the rules of your innate(固有的)sleep needs. You’ll feel better．“When you put away sleep debt,you become a superman,”says Stanford's Dement，talking about the improved mental and physical capabilities that come with being well rested．

53．If you have short-term sleep lack，you may___________．   

A．put on weight    B．get heart disease  C．hate eating food   D．have a poor sight

54．The example of sleep math is used to show______．

A．in what case you build up a sleep debt

B．in what way you can make up for lack of sleep

C．why you are energetic even without enough sleep

D．why you need six hours’sleep every night

55．By saying the underlined sentence，Dement means that______．

A．you need a lot of sleep to be a superman

B．you will be in a good state with enough sleep

C．you need to be a superman to repay sleep debt   

D．you will become a superman with more sleep debt

56．What might be the most suitable title for the passage?   

A．How can you keep energetic?    B．What is sleep debt?

C．Can you catch up on lost sleep?  D．Can coffee refresh you?

（15分）在火箭推进器中装有强还原剂肼(N₂H₄)和强氧化剂过氧化氢，当它们混合时，即产生大量氧气和水蒸气，并放出大量热。已知0.4mol液态肼与足量过氧化氢反应，生成氮气和水蒸气，放出256.65kJ的热量。

(1)写出肼和过氧化氢的电子式：肼___________________，过氧化氢______________ 。

(2)写出该反应热化学方程式：________________________________________________。

(3)已知H₂O(1)==H₂O(g) △H＝+44kJ／mol，则16g液态肼与足量液态过氧化氢反应生成氮气和液态水时，放出的热量是_____________________ kJ。

(4)上述反应用于火箭推进剂，除释放大量热和快速产生大量气体外，还有一个很突出的优点是：_____________________________________________________________________。

党的十八大报告提出“两个翻番”，到2020年实现国内生产总值(GDP)和城乡居民人均收入比2010年翻一番。下列关于“两个翻番”表述错误的是（）。

A．党的十八大首次对城乡居民收入增长提出了量化目标

B．到2020年我国城乡居民每人收入预计都能够实现倍增

C．城乡居民人均收入翻番是GDP翻番的出发点和落脚点　　

D．到2020年我国GDP预计将超过2000年GDP的4倍