题目内容

（2014年北京市西城区高三5月二模试题）21. — You look great!

— I ______ out. Check out my muscles!

A. will work B. was working

C. have been working D. had been working

 

C

【解析】句意：—你看起来很棒啊！—我一直都在锻炼。你 看看我的肌肉！根据句意可知正是因为一直都在锻炼所以现在才会与如此好的肌肉和体型，得到了对方的夸奖。使用现在完成进行时，表示从过开始一直持续到现在都在不停地锻炼。故使用现在完成进行时。C正确。

【试题延伸】本题难度适中。动词是高考考查的热点，需要考生记牢它们的用法及句法，还需有分析理解句子结构的能力。动词时态与语态也是高中阶段的重难点之一，需要考生能够理解句意进而对动词的时态做出正确的判断。

 

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Caffeine not only gives us a daily jump start, but new research suggests it also can strengthen long-term memory.

According to the US Food and Drug Administration, nearly 90 percent of people worldwide consume about 200 milligrams of caffeine each day. That' s equivalent to about one strong cup of coffee a day. Writing in " Nature Neuroscience" , Johns Hopkins University researchers say their findings show that caffeine strengthens certain memories for up t0 24 hours after being taken in.

" We've always known that caffeine has cognitive-enhancing effects (促智效果) , but its ,particular effects on strengthening memories and making them resistant to forgetting has never been examined in detail in humans, " said senior author of the paper Michael Yassa. " We re- port for the first time a specific effect of caffeine on reducing forgetting over 24 hours. " Conducting a double-blind trial, the researchers worked with a test group of people who didn't regularly consume caffeinated products. Five minutes after studying a series of images, the test subjects were given either a placebo(无效对照剂) or a 200-milligram caffeine tablet.

To check the caffeine levels of their test subjects, the research team took saliva samples (唾液样品) from them before they took their tablets and again one, three and 24 hours after- wards.

Both groups of test participants ( those who took the placebo and those who took the caffeine tablet) were tested the following day to see if they could recognize the images they' d seen the previous day.

The test included showing the test subjects another series of images that included some new images , those that were shown the previous day, as well as other images that were similar, but not the same as those they had viewed earlier.

The researchers found that more members of the group who were given the caffeine tablets were able to correctly identify some of the new images as " similar" to previously viewed images rather than incorrectly identifying them as the same.

"We also know that caffeine is associated with health and longevity(长寿) and may havesome protective effects from cognitive decline like Alzheimer' s disease (阿尔茨海默症). " said Yassa.

1.The purpose of the new research is

A. to survey how much caffeine people consume a day

B. to write the paper " Nature Neuroscience"

C. to prove caffeine has cognitive-enhancing effects

D. to examine caffeine ' s memory-strengthening effects in detail

2. During the research ,the researchers did the following things EXCEPT

A. giving the test subjects placebos or caffeine tablets

B. checking the caffeine levels of the test subjects

C. encouraging the test subjects to drink more coffee

D. showing the test subjects series of images

3. How did the test subjects show the caffeine ' s memory-strengthening effects?

A. By recognizing images they ' d seen the previous day.

B. By taking the caffeine tablets instead of placebos.

C. By identifying the new images as the same.

D. By telling the differences between new images.

4. What will the next part of the text possibly talk about?

A. Ways to achieve health and longevity. B. The effects caffeine has on health.

.C. The treatment for Alzheimer' s disease. D. The harmful effects of cognitive decline.

 

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