题目内容

The fact that many college graduates get lower salary than some workers has ________ an online debate.

A. turn down B. turn off

C. set down D. set off

 

D

【解析】

试题分析:考查动词短语辨析。句意:大学毕业生的工资低于一些农民工工资的事实在网上引发了热烈讨论。A拒绝;B关掉;C写下,制定;D出发,引爆,引发,故选D。

考点:考查动词短语辨析

 

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Below is a selection from a popular science book.

If blood is red, why are veins(静脉) blue?

Actually, veins are not blue at all. They are more of a clear, yellowish colour. Although blood looks red when it's outside the body, when it's sitting in a vein near the surface of the skin, it's more of a dark reddish purple colour. At the right depth, these blood-filled veins reflect less red light than the surrounding skin, making them look blue by comparison.

Which works harder, your heart or your brain?

This question depends on whether you're busy thinking or busy exercising. Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker. But, in the long run, your brain probably tips it, because even when you're sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it.

Do old people shrink as they age?

Yes and no. Many people do get shorter as they age. But, when they do, it isn't because they're shrinking all over. They simply lose height as their spine(脊柱) becomes shorter and more curved due to disuse and the effects of gravity(重力). Many (but not all) men and women do lose height as they get older. Men lose an average of 3-4 cm in height as they age, while women may lose 5 cm or more. If you live to be 200 years old, would you keep shrinking till you were, like 60 cm tall, like a little boy again?No, because old people don't really shrink!It is not that they are growing backwards—their legs, arms and backbones getting shorter. When they do get shorter, it's because the spine has shortened a little. Or, more often, become more bent and curved.

Why does spinning make you dizzy(眩晕的)?

Because your brain gets confused between what you're seeing and what you're feeling. The brain senses that you're spinning using special gravity and motion sensing organs in your inner ear, which work together with your eyes to keep your vision and balance stable. But when you suddenly stop spinning , the system goes out of control, and your brain thinks you're moving while you're not!

Where do feelings and emotions come from?

Mostly from an ancient part of the brain called the limbic system. All mammals have this brain area—from mice to dogs, cats, and humans. So all mammals feel basic emotions like fear, pain and pleasure. But since human feelings also involve other newer bits of the brain, we feel more complex emotions than any other animal on the planet.

1.What is the colour of blood in a vein near the surface of the skin?

A. Blue. B. Light yellow.

C. Red. D. Dark reddish purple.

2.Why do some old people look a little shrunken as they age?

A. Their spine is in active use.

B. They are more easily affected by gravity.

C. They keep growing backwards.

D. Their spine becomes more bent.

3.Which of the following statements about our brain is TRUE?

A. In the long run, our brain probably works harder than our heart.

B. When our brain senses the spinning, we will feel dizzy.

C. The brains of the other mammals are as complex as those of humans.

D. Our feelings and emotions come from the most developed area in our brain.

4.What is the main purpose of the selection?

A. To give advice on how to stay healthy.

B. To provide information about our body.

C. To challenge new findings in medical research.

D. To report the latest discoveries in medical science.

 

You will spend hours at the gym training your body, but do you ever think about training your brain? Here are four ways to keep your brain mentally (脑力上地) active and healthy.

Play games

Your brain is a muscle just like the ones in the rest of your body. If you don’t use it, you will lose it. For example, doing a crossword puzzle (纵横填字游戏) once a day is a good way to give the brain the exercise it needs. This kind of puzzle is good at training different areas of the brain. But remember that when doing this puzzle, you should gradually increase the complexity (复杂度); otherwise, it will become repetitive (重复乏味的) and stop being mentally challenging.

Talk aloud

Although it might sound strange to you, talking aloud is a great way to boost your memory. A good exercise to try is counting to 99 in threes as fast as you can.

Be a team leader

If you find you can do your work very easily, you should find a new task. It is important that your job should be mentally challenging. Complex jobs are often more challenging and make the brain work a little harder.

Learn a language

A study found that, compared with those who could speak only one language, the people who could speak two languages had a slower rate of cognitive (认知能力) decrease. Learning a new language is very challenging and it makes sure that different areas of the brain have their lights on.

1.What is the main idea of this passage?

A. Why you should train your brain.

B. How to be a good team leader.

C. Training the brain is more important than training the body.

D. How to make your brain healthy and work actively.

2.Which word can replace the word "boost" in the third paragraph?

A. Change. B. Promote.

C. Decrease. D. Lose.

3.We should gradually increase the complexity when doing crossword puzzles because ______.

A. if we don’t use our brain, we will lose it

B. we should make our brain face different challenges

C. our brain is a muscle like other parts in our bodies

D. these puzzles can work on different areas of the brain.

 

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