将全部投资资金集中投资于短期证券或长期证券的投资方法属于（）投资法。 A.期限分离

回答（）观察理解的基本视点与方法手段。

为了提高计算机联锁系统的安全性，系统联锁计算机的硬件结构采用双机热备的或门二重冗余系统。

阅读理解

     Few of us make money by losing sleep.But three graduate students at Brown University in

Providence built a company around sleep deprivation.

     Jason Donahue, Ben Rubin and Eric Shashoua were working late nights in Brown's business

and engineering schools-and began thinking about ways to sleep better.

     They discovered they weren't alone in burning the midnight oil.Around 20% of Americans get

less than six hours of rest a night.

     The friends imagined a smart alarm clock that could track how much time we spend in the most

restorative(促使康复的) stages of the sleep cycle:REM(快速眼动) and deep sleep.What would it

cost to design such a thing?Five years of research,20 employees, $ 14 million in funding and a whole

lot of doubting from investors and scientists.

     The company, Zeo, based in Newton, Mass., launched its product in June.The Zeo device uses

a headband with tiny sensors(传感器) that scan your brain for signs of four sleep states:REM, light,

deep and waking sleep.The smart alarm clock displays a graph of your sleep pattern and wakes you

as you're transitioning out of REM sleep (which is when you're least sleepy). In the morning you can

upload the data to the company's website, and so track your sleep over time.The cost, $ 399, includes

six months' access to one of Zeo's online sleep coaches.Most of the feedback comes in the form of

Zeo's ZQ score showing how well you've slept.

     "Zeo allows people to unlock this black box of sleep, "says Dave Dickinson, a healthcare CEO.

Whether any of this actually improves sleep is up to the consumer, who will also need to make lifestyle

changes like cutting out alcohol before bedtime or caffeine after 3 p. m..

      For now the company is selling Zeo online only.Dickinson also plans to expand to countries such as

Australia, where sleep deprivation approaches US levels.

1. Why did the three students imagine a smart alarm clock?

A. To earn enough money for a scholarship.

B. To wake them up on time in the morning.

C. To record the length of their sleep time.

D. To improve the quality of their sleep.

2. Which of the following is TRUE according to the passage?

A. It took 14 employees five years to develop the product.

B. Their research received a lot of support from investors.

C. About one in five Americans suffers from poor sleep.

D. Alcohol or caffeine before bedtime affects sleep.

3. Which is the correct order of how the Zeo device works?

a. wake you when you're least sleepy

b. scan your brain for sleep signs

c. get the Zeo's ZQ score

d. show a graph of your sleep pattern

e. upload the data to the company's website

A. d, b, a, e, c       

B. b, a, d, c, e

C. d, b, a, c, e  

D. b, d, a, e, c

4. The Zeo's ZQ score is connected with________.

A. the quality of sleep  

B. the length of sleep

C. the time of waking up 

D. the time of going to bed

5. From the passage we can learn that________.

A. Zeo will have a direct effect on users' lifestyles

B. Zeo will have better results if users make proper changes

C. Zeo is reported to be well received in Australia

D. Zeo can now be bought either in stores or online

证券交易必须遵循公开原则，其核心要求是( )。

A．防止证券交易中的欺诈行为

B．公正地对待证券交易的参与各方

C．实现市场信息的公开化

D．保证参与交易的各方机会均等

某村造出一种让人叹为观止的财政民主形式，即把一枚公章一破为五，由各村小组选一个代表，再加上一名支部委员，各管一瓣。村里的开销必须经其中至少三人同意，五瓣才能合并起来盖章，从而保证村民委员会的清正廉洁。

下列对于村民委员会认识正确的是（）。

①是我国的基层 * * 组织

②是我国的基层群众自治组织

③是我国民主的重要组成形式

④由乡镇人民代表大会产生

A.①②

B.②③

C.②④

D.①③