题目内容

Microsoft ended support for Windows XP after April 8, which _______a major operating system for some Chinese computer users, and advised users to upgrade to Windows 8.1.

A. remained B. remains C. is remaining D. is remained

 

B

【解析】

试题分析：句意：微软在4月8日结束支持Windows XP,这对一些中国电脑用户仍然是一个主要的操作系统,并建议用户升级到Windows 8.1。remain表示”仍然是”是连系动词，不能用被动，因为Windows XP现在对一些中国电脑用户仍然是一个主要的操作系统，所以用一般现在时，选B。

考点：考查时态语态

 

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EVERYONE has those nights – you lie in your bed for hours, tossing and turning, totally unable to fall asleep. You wish you could just turn your brain off as if it were a light. That would make things much easier, wouldn’t it?

Now it looks like you are one step closer to this wild dream of yours – scientists from Oxford University, UK have just discovered the “switch” that tells the brain to go to sleep, reported Forbes.

To understand the study, you first need to know that there are two mechanisms (机能) that regulate sleep. There’s one that we’re already familiar with – our body clock, which works in a 24-hour cycle based on the light changes throughout the day.

The other one is what scientists call the sleep “homeostat (动态平衡系统)”. This mechanism has nothing to do with daylight. Instead, it keeps track of the brain’s waking hours and urges it to rest if it has been awake for a long time. “It is similar to the thermostat (自动调温器) in your home. A thermostat measures temperature and switches on the heating if it’s too cold,” Professor Gero Miesenb?ck, who led the study, told The Telegraph.

Our bodies use both of the mechanisms to regulate sleep. “The body clock says it’s the right time, and the sleep thermostat has built up pressure during a long waking day,” explained Miesenb?ck.

There is no way that scientists can trick the body clock. But with the sleep homeostat, there might be something they can do.

The researchers found that the sleep homeostat works by activating a specific group of nerve cells, or neurons, in the brain. They tested their theory on fruit flies by removing the neurons from the insects’ brains. And as expected, they found that the flies without the homeostat neurons did not keep a regular sleep pattern anymore.

Now that scientists have pinpointed (定位) the exact place in the brain – or, the “switch” – that regulates sleep, they can begin investigating (研究) how to activate these cells at any given time so that people can be sent to sleep instantly.

More importantly, figuring out how sleep mechanisms work may also help us to one day unravel one of the oldest mysteries of all: why do we need to sleep in the first place?

1.What is the article mainly about?

A. A new way to treat sleep disorders.

B. The discovery of the sleep “homeostat”.

C. Advice on what to do when you fail to fall asleep.

D. A comparison of the two mechanisms that regulate sleep.

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A. Through examples.

B. With comparisons.

C. Through cause and effect analysis.

D. By presenting research findings.

3.What can we conclude from the article?

A. Generally, the sleep homeostat has less effect on people during the day than at night.

B. There is little scientists can do to affect the way the sleep homeostat works.

C. What makes us go to sleep at night is probably a combination of the two mechanisms.

D. The more homeostat neurons there are in one’s brain, the more easily one can fall asleep.

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　　The 19th-century character model was based on an understanding of free will. Today, we know that free will is bounded. People can change their lives, but ordering change is not simple because many things, even within ourselves, are beyond our direct control.

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This is my world now; it’s all I have left. You see, I’m old. And, I’m not as healthy as I used to be. I’m not necessarily happy with it, but I accept it. Occasionally, a member of my family will stop in to see me. He or she will bring me some flowers or a little present, maybe a set of slippers—I’ve got eight pairs. And then they will return to the outside world and I’ll be alone again. Oh, there are other people here in the nursing home. Residents, we’re called. The majority are about my age. I’m 84. Many are in wheelchairs. The lucky ones are passing through—a broken hip, a diseased heart, something has brought them here for rehabilitation(康复). When they’re well they’ll be going home.

The help here is basically pretty good, although there’s a large turnover of staff. Just when I get comfortable with someone he or she moves on to another job. I understand that. This is not the best job to have. I don’t much like some of the physical things that happen to us. I don’t care much for a diaper(尿布). I seem to have lost the control acquired so diligently as a child. The difference is that I’m aware and embarrassed, but I can’t do anything about it. I’ve had three children, and I know it isn’t pleasant to clean another’s diaper. My husband used to wear a gas mask when he changed the kids. I wish I had one now.

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