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Culture shock is a special disease for people who have suddenly moved to a foreign country.     .
Culture shock is caused by the anxiety that results from losing all familiar signs of social communication.    When to shake hands and what to say, when we meet people, when and how to give tips, how to do shopping, when to accept and refuse invitations, when to take statements seriously and when not. These signs, which may be words, gestures, facial expressions, or customs, are acquired（获得） by all of us in the course of growing up and as much a part of our culture as the language we speak or the beliefs we accept.      .
Now when a person enters a strange culture, all or most of these familiar signs are removed. No matter how broadminded will you may be, a series of supports have been knocked from under you, followed by a feeling of failure in much the same way. “The ways of the host country are bad because they make us feel bad.” When foreigners in a strange land get together to complain about the host country and its people, you can be sure that they are suffering from culture shock.
Another phrase of culture shock is regression（退化）. The home environment suddenly becomes very important. To the foreigner, everything becomes unreasonably beautified. All the difficulties and problems are forgotten and only the good things back home are remembered.       .

A．Nowadays a lot of people work at home.

B．The children are taught to respect different cultures ．

C．Like most illnesses, it has its own symptoms（病症） and cures.

D．It usually takes a trip home to bring one back to reality.

E. First they reject the environment which causes discomfort.
F. Those signs include many ways in which we are used to the situation of daily life.
G. All of us depend on hundreds of these signs, most of which we do not carry on the level of conscious awareness（察觉）.