Eye doctors in Shanghai found out that the nearsightedness among primary and middle school students has something to do with the colour of the paper in their textbooks and notebooks．

　 The doctors suggested that yellow paper will be used to replace the white one．According to

their research，the experts found out white paper reflects too much light and easily tires a person’s eyes．The yellow paper，however，doesn’t look so sharp to a person’s eyes．In other words，it is much milder to the eyes of students who may do reading or writing for hours．

The experts’research findings were based on first．hand information and a number of scientific experiments including a new study among the students from forty-one middle schools．To make the students understand the truth，Shanghai Education Development Co．Ltd．has produced textbooks and exercise．books made of yellow paper．The books will be used in the whole city soon．

(　 )49．What does the word“replace”here mean in Chinese?

　　　 A．放置　　　　 　B．重置　　　　 C．替代　　　　 D．发生

(　 )50．The doctors found out_________ caused the students’nearsightedness．

　　　 A．their studies have　　　　　　　　 B．the colour of the paper has

　　　 C．the textbooks and notebooks have　　 D．the colour of their clothes has

(　 )51．Why does white paper easily make our eyes tired?

　　　 A．Because white paper reflects too much light．

　　　 B．Because white paper gets in too much light．

　　　 C．Because white paper is always shining．

D．Because white paper is too bright．

　

Sorry to say, our brains naturally start slowing down at the young age of 30. It used to be thought that this couldn't be helped, but new studies show that people of any age can train their brains to work faster. "Your brain is a learning machine," says University of California scientist Dr. Michael Merzenich. Given the right tools, we can train our brains to act like they did when we were younger. All that's required is the practice designed just for the purpose: a few exercises for the mind.

Merzenich has developed a computer-based training method to speed up the process（过程） in which the brain deals with information (positscience.com). Since much of the data we receive comes through speech, the Brain Fitness Program works with language and hearing to better speed and accuracy （准确性）.Over the course of training, the program starts asking you to tell sounds (between "dog" and "bog", for example) at an increasingly faster speed. It's a bit like tennis instructor, says Merzenich, hitting balls at you faster and faster to keep you challenged. You may start out slow, but before long you're pretty quick.

The biggest finding in brain research in the last ten years is that the brain at any age is highly plastic. If you ask your brain to learn, it will learn. And it may even speed up while in the process. To keep your brain young and plastic you can do one of a million new activities that challenge and excite you：playing table tennis or bridge, doing crossword puzzles, learning a language.... "When it comes to preventing ageing, you really do 'use it or lose it'," says Barbara Sahakian, professor at Cambridge University.

51. According to the new studies, what will happen to our brains?

A. They will not start slowing down until the age of 30

B. They will start working slowly after the age of 30

C. They can work as well as at a young age through certain exercises

D. They can not be improved once they start to slow down

52. The writer mentioned many ways to speed up your brain, EXCEPT_____

A. doing a million new activities　　

B. sleeping as much as possible　

C. playing some intelligent games

D. playing table tennis

53. What can we learn from the text?

A. Using right tools is important for brains’ work.　　

B. Brain research deals with information from the Internet　

C. Dr. Merzenich is a scientist in computer,

D. Many activities can keep our brains young.

54. Which of the following agrees with the writer’s idea?

A. The train methods work better for the old.

B. People should train the brain to stop it from aging.

C. The training of the brain should start at an early age.

D. It is necessary to take part in as many activities as possible.

55. Which one is TRUE according to the passage?

A. If you are 71 years old, your brain is too old to train.

B. You can eat the food to keep your brain young and plastic.

C. Merzenich has developed a computer-based training method to train brains.

D. You will feel younger when you train your brain.

In ancient languages, the seven days of the week were named after the sun, the moon, and the five planets that ancient people knew about (luckily, they only knew about five planets then, or our weeks would be much longer). There is a good reason that in English “Sunday” has the word “sun” in it. Sunday seems to be everyone’s favorite day of the week. It makes sense that it’s named after everyone’s favorite thing in the sky! Do any other weekday names sound like astrological (占星的) words? How about “Monday” and “Moon”, or “Saturday” and “Saturn”?

If you learn French or Spanish, you will see even more planets in the names of the days of the week. These languages are rooted in Latin(拉丁文) and the Latin names match the planet names for all seven days.

English is a strange language. It is very confusing. The days of the week are a perfect example of this confusion. A few are from Latin, and a few are from German. “Tuesday” is named after a German God: Tiw (Tiw’s day). Friday is named after a German Goddess(女神): Freya. English words change spelling, meaning and roots that are based on wars and kings. That’s why English is so hard to learn! Learning the names of the week can be like a history lesson in itself!

46. Which day of the week was named after the moon?

A. Sunday　　　 　　 B. Monday　 　　 C. Saturday　 　　 　　D. Tuesday

47. We can tell from the story that “Saturn” is _______.

A. a planet’s name　 B. a strange language C. a God’s name　 D. a Goddess’ name

48. The underlined words “everyone’s favorite thing” in Paragraph 2 refers to _______.

A. Monday　　　　 B. Sunday　　　 C. the moon 　　　　D. the sun

49. Which day is from German?　 A. Sunday B. Monday　 C. Tuesday　　 D. Saturday

50. The story mainly tells us ________.

A. what the seven days of the week are named after

B. how the English language changes　　　 　

C. Why there are seven days in a week　

D. Which day of the week is people’s favorite