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Early in the 16 th century men were trying to reach Asia by travelling west from Europe. In order to find Asia they had to find a way past South Africa. The man who finally found the way from the Atlantic Ocean to the Pacific was Ferdinand Magellan. Magellan sailed from Seville in August 1519 with five ships and about 280 men. Fourteen months later, after spending the severe (的) winter on the coast of Patagonia, he discovered the channel (海峡) which is now called Magellan Straits. In November 1520, after many months of dangers from rocks and storms, the three remaining ships entered the ocean on the other side of South America. They then continued, hoping to reach Asia. But they didn’t see any land until they reached the islands off the coast of Asia. Before they arrived at these islands, later known as Philippines, men were dying of starvation. While they were in the Philippines., Magellan was killed in battle. The remaining officers then had to get back to Spain. They decided to sail around Africa. After many difficulties, one ship with eighteen men sailed into Seville after leaving. They were all that remained of Magellan’s expedition (探险队). 小题1:Magellan Straits were discovered by Magellan ______. A.in August 1519 B.in October 1520 C.in November 1520 D.in December 1520 小题2:The number of the ships lost on the whole expedition was ______. A.two B.three C.four D.five 小题3:Which of the following is NOT mentioned in the text? A.Dangers from rocks and storms B.Lack of fresh food and water C.Severe winter in Patagonia D.The death of Magellan
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举一反三
【单选题】关系运算中的并、差和交都是________运算
A.
一元
B.
二元
C.
多元
D.
运算对象个数不限
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【判断题】丙酮酸是糖酵解和糖有氧氧化的共同中间代谢产物。
A.
正确
B.
错误
【单选题】糖酵解和糖有氧氧化的共同中间代谢物是(    )
A.
乳酸    
B.
丙酮酸    
C.
乙酰CoA    
D.
草酰乙酸
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【单选题】《聊斋志异》创作的主旨是
A.
宣扬怪异非常之事
B.
寄托思想感情,表现对现实的意见
C.
娱乐方式
D.
丰富史料
【简答题】传统关系运算中交、并、差运算要求参与运算的关系R和关系S是( )
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【单选题】在关系代数运算中,专门的关系运算是( )。
A.
并、差和交
B.
并、差、交和乘积
C.
并、差、交、选择、投影和连接
D.
选择、投影和连接
【简答题】什么是和运算、差运算、交运算?
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