系统的单位调节功率是计及（ ）的调节效应时，引起频率单位变化时的负荷变化量。
A. 发电机
B. 变压器
C. 线路
D. 负荷
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This essay is written to .
A. introduce to people a known use of green bananas
B. describe the author's unusual travel experiences in Brazil
C. tell people how he happened to discover the real center of the world
D. show how a respect for other civilizations will open our eyes
The man who wrote this essay was .
A. a Brazilian traveler in a part of his country he had never been to before
B. a Brazilian from Rio who had received his education in England
C. an American from New England traveling in Brazil
D. a Latin American driving through the mountainous area of Brazil
The author is now convinced that .
A. It is natural for all people to think of the center of the world as being somewherevery familiar to them
B. there can be only one center of the world and it is where he was born in NewEngland- people in other countries do not know this
C. there can be only one center of the world and it is the rock pinnacle in theBrazilian village but most Americans do not know this
D. there are two centers of the world, one in the United States in the cultural sense,and the other in Brazil in the geographical sense
The green banana in Paragraph 8 refers to .
A. a method by which leaks in a radiator can be fixed
B. the funny things you experience when you travel in a foreign country
C. wisdom that is to be discovered in other cultures by an open mind
D. the different varieties of bananas to be found in other countries
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