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【单选题】
在直角坐标系xOy中， 分别是与x轴，y轴平行的单位向量，若直角三角形ABC中， ，则k的可能值有 [ ]A.
1个
B.
2个
C.
3个
D.
4个
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【简答题】Over 30 000 years ago,people from northern Asia went to America.Today we can tell these people Indians. The Indians went to America because the weather began to change.Northern Asia became very cold.E...
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【单选题】People from Northern Ireland, Scotland or Wales like to be addressed _______.
A.
British
B.
Englishman
C.
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D.
Welsh
【单选题】以下陈述最佳的是
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B.
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C.
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D.
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A.
They want to be free from political and religious oppression from the central government of UK
B.
They want to explore the new world and seek fortune.
C.
They do not want to die in famine in the Island of Great Britain
D.
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A.
正确
B.
错误
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【简答题】Over 30,000 years ago, people from northern Asia went to America. Today we can tell these people Indians. The Indians went to America because the weather began to change. Northern Asia became very col...
【单选题】以下陈述最佳是
A.
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B.
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C.
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D.
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【简答题】To people from the northern parts of the country, tropical butterflies may seem incredible big.