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主干不明显或到达一定高度即分枝，树形整体呈现卵圆形、球形，下列那种植物的树形满足以上条件（      ） A.
桂花 B.
银杏 C.
雪松 D.
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单项选择题
4. The Dark Ages
The Dark Ages are the period in Europe after the fall of the Greek and Roman Empires in 476 to the emergence of the Italian Renaissance in 1420. The term is also synonymous with the Middle Ages, or the Medieval Period, in which the Empire was overrun by the German Barbarian tribes and Rome herself was completely destroyed.
The Visigoths, Huns and Vandals had no interest in learning, in architecture, or in culture. They were warrior tribes who were always at war. So buildings, libraries, works of art were all destroyed across Western Europe. This marks the end of a period of artistic, intellectual, economical, and political advancements.
The Dark ages were a period of no real developments of anything except superstition and a belief in witchcraft. There too many disadvantages in different aspects. The collapse saw the end of stable government, schools, libraries, monetary system and a common language. During this period development of the human race was slowed down by 1,000 years. Many of the old arts and crafts were lost, and intellectual activity barely existed. People were forced to turn to the landowners to protect them. Life was now no more than growing the crops and rearing animals to provide food. 
Fortunately, Ireland had never been conquered by the Romans and was ignored by the Barbarians. The ancient Celtic civilization that had disappeared in Europe still flourished here. The Celts have a great love of learning and it is this that eventually saved Europe from the Dark Ages. The lost knowledge of the ancient Greeks and Romans was rediscovered in the Irish monasteries of France and Italy.
However, the Darkness still continued for the majority of people. It came to a terrible head in the 14th century when the entire continent was overrun by the great plague known as the Black Death. It is thought that 100 million people died as a result.
It was, we now know, the terrible, frightening, finale to the Dark Ages.
  7. From the passage, which of the following statement is NOT true?
A．The Dark Ages is also called The Medieval Period.
B．The Dark Ages began just after the fall of Rome and it dominated the European continent until the early 14th century.
C．The Dark Ages is regarded as a backwards time in human history.
D．There was no real developments of anything during the Dark ages.
单项选择题
饭菜保温的原则是()
A、不给容器加盖,缩短送饭时间
B、延长送饭时间
C、冬季保温、夏季散热
D、放到婴幼儿不易够到的地方
多项选择题
一般而言，消费者价格心理，主要包括以下常见形式：（                  ）。
A、习惯性价格心理
B、敏感性价格心理
C、倾向性价格心理
D、感受性价格心理
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