Passage 1
Researchers have found that REM (rapid eye movement) sleep is important to human beings. This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence. The deeper a person’s sleep becomes, the longer the periods of rapid eye movement. There are physical charges in the body to show that a person has changed from NREM (non-rapid eye movement) to REM sleep. Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly. Accompanying these physical changes in the body is a very important characteristic of REM sleep. It is during REM sleep that a person dreams.

Paris is the capital of the European nation of France. It is one of the most beautiful and 41 cities in the world. Paris is called the City of Light. It is 42 an international fashion center. What stylish women are 43 in Paris will be worn by women 44 the world. Paris is also a famous world center of education. For instance, it is the headquarters of UNESCO ( 联合国教科文组织),the United Nations 45 ,Scientific, and Cultural Organization. The Seine River（塞纳河） 46 the city into two parts. Thirty-two bridges 47 this scenic river. The oldest and 48 most well-known is the Pont Neuf, 49 was built in the sixteenth century. The Sorbonne （索邦大学）, a famous university, 50 on the Left Bank(south side) 51 the river. The beautiful white church Sacre Coeur lies 52 the hill called Montmartre on the Right Bank(north side)of the Seine. There are many other famous places in Paris, 53 the famous museum the Louver （卢浮宫) 54 the cathedral of Notre Dame（巴黎圣母院）. However, the most famous landmark in this city 55 the Eiffel Tower（埃菲尔铁塔).Paris is named 56 a group of people 57 the Parisii. They 58 a small village on an island 59 the Seine River about two thousand years ago. This island, called the Ile de la Cite, is 60 Notre Dame is Located. Today around eight million people live in the Paris area.

Paris is the capital of the European nation of France. It is one of the most beautiful and 41 cities in the world. Paris is called the City of Light. It is 42 an international fashion center. What stylish women are 43 in Paris will be worn by women 44 the world. Paris is also a famous world center of education. For instance, it is the headquarters of UNESCO ( 联合国教科文组织),the United Nations 45 ,Scientific, and Cultural Organization. The Seine River（塞纳河） 46 the city into two parts. Thirty-two bridges 47 this scenic river. The oldest and 48 most well-known is the Pont Neuf, 49 was built in the sixteenth century. The Sorbonne （索邦大学）, a famous university, 50 on the Left Bank(south side) 51 the river. The beautiful white church Sacre Coeur lies 52 the hill called Montmartre on the Right Bank(north side)of the Seine. There are many other famous places in Paris, 53 the famous museum the Louver （卢浮宫) 54 the cathedral of Notre Dame（巴黎圣母院）. However, the most famous landmark in this city 55 the Eiffel Tower（埃菲尔铁塔).Paris is named 56 a group of people 57 the Parisii. They 58 a small village on an island 59 the Seine River about two thousand years ago. This island, called the Ile de la Cite, is 60 Notre Dame is Located. Today around eight million people live in the Paris area.