根据下面的对话情景，在每个空白处填上一个合适的句子，使对话的意义连贯、完整。

 ( After the graduation ceremony, Tan Li and Wu Qian are talking about their summer vacation plans on the playground. ) Tan Li = T  Wu Qian = W

T: Hey, Wu Qian.  Our junior high scnool life has come to an end.  What are you going to do this summer vacation?

W: 1.                The scenery there is very bea4utiful.

T: Sounds great.  Is considered as the Treasure Island of China  Where will you go?'

W: I'll go to Sun Moon Lake and other tourist attractions. 2._____________

T: NO. I've never been there before. 3._________________________

W: By ship.  It is a little slow but interesting.

T: 4.______________________________

W: In half a month.

T: 5.____________________________

W: Thank you.

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.