【正文】 ade the monkeys39。 blood go through a machine which cooled the blood, and then sent the blood back to the monkeys39。 brains. When the brain temperature was 50 degrees, Dr. White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After their operations the monkeys were like they were before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.Passage 27 DepressionThe dictionary describes depression as the state of feeling very sad, anxious and hopeless. The question here is why one gets depressed. Is it the inability to deal with the situation or the high stress levels that e with success or failure?Life is full of twists and turns. Some are pleasant and some are not so pleasant, and sometimes even terrible. No one has a lack of problems in his or her life. Everyone has a personal set of problems.Even the people who constantly have a smile on their faces have problems. The only difference is that they know how to deal with the problems and smile about the fact that they can overe them.Seasonal changes are the main reason for depression in nature. Change is unavoidable. It may happen in nature or in life, but the way the change makes us feel is subjective1. They differ from person to person, along with the ways we deal with them.Feeling depression is a normal phenomenon2, but letting it overtake3 us pletely is not the best thing. There are no specific rules or concepts to deal with it. Whatever way a person feels is the best way to deal with it should be adopted, but be sure it will not hurt another person.Passage 28 White NoiseThere are different kinds of noise with distinct frequencies that are classified by color，namely: white noise, pink noise, brown noise, blue noise, and gray noise. Below is an overview of white noise.Generally speaking, white noise is a part of the full scale of sound frequencies a human ear can recognize. White noise is a mixture of sound frequencies in equal levels. It is a very quiet sound that is relaxing and pleasant to the ears of anyone. A number of people say that it is similar to the sound of the rain or the ocean waves.White noise offers countless benefits. The noise es in different forms that serve different purposes. Some white noise works better than others for particular uses. Some people may find some white noise sounds more pleasing than others. Moreover, white noise is said to have a more calming effect than music does.Passage 29 Cell PhoneNowadays, with the rapid development of IT and information industry,/ cell phones play a dominant role in people’s life. /On the one hand, the mobile phone is portable and convenient. /Being wireless, you can carry them everywhere with great ease. /You can reach a person wherever and however far away he is./ On the other hand, it is a friend indeed./ Whenever you e across trouble, you can call for help immediately./However, just as every coin has two sides,/ the cell phone also has its many disadvantages. /Some people plain that mobile phones give unpleasant noise on some important occasions/ when the owner forgets to turn them off. /And it also cuts into people’s spare time,/ because with the mobile phone the boss can easily reach them and call them to duty during their spare time. /Worst of all, the electromagnetic wave emitted from the phone is said to be harmful to people’s health/ and does often cause headaches to the owner./Passage 30 Facing the Enemies WithinWe are not born with courage, but neither are we born with fear. Maybe some of your fears are brought on by your own experiences, by what someone has told you, by what you’ve read in the papers. Fears, even the most basic ones, can totally destroy your ambitions, fortunes, relationships, and even life.Another enemy we face is indecision. Indecision is the thief of opportunity and enterprise. It will steal your chances for a better future.The third enemy inside is doubt. Sure you can’t believe everything. But don’t let doubt take over you. It will destroy your life and your chances of success. It will empty both your bank account and your heart.Also, there are indifference, worry and over caution that you should do battle with. Be courageous in your life and in your pursuit of the things you want and the person you want to bee.Passage 31 The tower of LondonIn 1078, King William began to build a large stone building on the north bank of the Thames River and named it the Tower of London. The tower was finished 20 years later.Around 1240, King Henry III made it his home. He painted the tower white, and widened the grounds to include a church, a great hall and other buildings.In 1381, Richard II became King of England. A group of farmers attacked the tower. In the end, Richard was forced to give up his power to Henry IV.Queen Elizabeth was held prisoner in the tower for two months by Queen Mary, her halfsister. She was set free on May 19, 1554, and in 1558 became the Queen of England.In I603, part of the tower became a museum. A lot of royal jewels were kept in the tower for visitors to see. The tower has been a place of interest in London ever since. (158 words)Passage 32 Can’tCan39。t is the worst word that can be written or spoken, and can do more harm than lying. Many strong spirits have been broken by it. It springs from the lips of thoughtless people each morning and robs us of the courage we need that day. It rings in our ears like a timely sent warning and laughs when we fall by the way.Can39。t is the father of weak effort, and the parent of fear and halfhearted work. It weakens the efforts of clever craftsmen, and makes people work less. It poisons the soul of a person with an illusion.It laughs at people39。s hopes and dreams.Whatever the goal you are seeking, keep trying, and answer by saying, I can! Can39。t is the enemy that is ready to ruin your will. It will only give way to courage, patienc