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When you first drift off into slumber，your eyes will roll about a bit，your temperature will drop slightly，your muscles will relax，and your breathing will become quite regular.Your brain waves slow down a bit，with the alpha rhythm predominating for the first few minutes.This is the first stage of sleep.For the next 30minutes or so，you will drift down through Stage 2and Stage 3.The lower your stage of sleep，the slower your brain waves will be.About 40-60minutes after you lose consciousness，you will reach the last stage.Your brain waves will show the delta rhythm.You may think that you stay at this deep stage all the rest of the night，but that turns out not to be the case.About 80minutes after you fall into slumber，your activity cycle will increase slightly.The delta rhythm will disappear，to be replaced by the activity pattern of brain waves.Your eyes will begin to dart around under your closed eyelids.This period of Rapid Eye Movements lasts for 8-15minutes and is called REM sleep.
During both light and deep sleep，the muscles in your body are relaxed but capable of movement.As you slip into REM sleep，a very odd thing occurs—most of the voluntary muscles in your body become paralyzed.Although your brain shows very rapid bursts of neural activity during REM sleep，your body is incapable of moving.REM sleep is accompanied by extensive muscular inhibition.
On the part of an average sleeper, there（）of sleep in cycles.

A．is one stage
B．are two stages
C．are six stages
D．are four stages

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Cross-Cultural Communication Challenges Definition of Culture We all communicate with others all the time--in our homes, in our workplaces, in the groups we belong to, and in the community. No matter how well we think we understand each other, communication is hard. Just think, for example, how often we hear things like; 'He doesn't get it,' or 'She didn't really hear what I meant to say.' 'Culture' is often at the root of communication challenges. Our culture influences how we approach problems, and how we participate in groups and in communities. When we participate in groups we are often surprised at how differently people approach their work together. Culture is a complex concept, with many different definitions. But, simply put, 'culture' refers to a group or community with which we share common experiences that shape the way we understand the world. It includes groups that we are born into, such as gender, race, or national origin. It also includes groups we join or become part of. For example, we can acquire a new culture by moving to a new region, by a change in our economic status, or by becoming disabled. When we think of culture this broadly, we realize we all belong to many cultures at once. Our histories are a critical piece of our cultures. Historical experiences--whether of five years ago or of ten generations back-- shape who we are. Knowledge of our history can help us understand ourselves and one another better. Exploring the ways in which various groups within our society have related to each other is key to opening channels for cross-cultural communication. Six Fundamental Patterns of Cultural Differences As people from different cultural groups take on the exciting challenge of working together, cultural values sometimes conflict. We can misunderstand each other, and react in ways that can hinder what are otherwise promising partnerships. Oftentimes, we aren't aware that culture is acting upon us. Sometimes, we are not even aware that we have cultural values or assumptions that are different from others! ?Different Communication Styles The way people communicate varies widely between, and even within, cultures. One aspect of communication style. is language usage. Across cultures, some words and phrases are used in different ways. For example, even in countries that share the English language, the meaning of 'yes' varies from 'maybe, I'll consider it' to 'definitely so,' with many shades in between. Another major aspect of communication style. is the degree of importance given to non-verbal communication. Non-verbal communication includes not only facial expressions and gestures; it also involves seating arrangements, personal distance, and sense of time. In addition, different norms regarding the appropriate degree of assertiveness in communicating can add to cultural misunderstandings. For instance, some white Americans typically consider raised voices to be a sign that a fight has begun, while some black, Jewish and Italian Americans often feel that an increase in volume is a sign of an exciting conversation among friends. Thus, some white Americans may react with greater alarm of a loud discussion than would members of some American ethnic or non-white racial groups. ?Different Attitudes Toward Conflict Some cultures view conflict as a positive thing, while others view it as something to be avoided. In the U.S., conflict is not usually desirable; but people often are encouraged to deal directly with conflicts that do arise. In fact, face-to-face meetings customarily are recommended as the way to work through whatever problems exist. In contrast, in many Eastern countries, open conflict is experienced as embarrassing or demeaning; as a rule, differences are best worked out quietly. A written exchange might be the favored means to address theA．YB．NC．NG

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