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【单选题】
Valencia is in the east part of Spain. It has a port on the sea, two miles away from the coast. It is the capital of a province that is also named Valencia. The city is the market centre for what is produced by the land around the city. Most of the city's money is made from farming. It is also a busy business city with ships, railways, clothes and machine factories. Valencia has an old part with white buildings, coloured roofs, and narrow streets. The modern part has long, wide streets and new buildings. Valencia is well known for its parks and gardens. It has many old churches and museums. The University in the centre of the city was built in the 13(上标)th century. The city of valencia has been known since the 2(上标)nd century. In the 8(上标)th century it was the capital of Spain. There is also an important city in Venzuela(委内瑞拉)named Valencia. The main income of the city of Valencia is from its______.
A.
markets
B.
business
C.
factories
D.
farming
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共生
B.
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【单选题】根瘤细菌生活在豆科植物根部细胞中,两者的关系是
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共生
B.
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C.
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【单选题】根瘤细菌生活在豆科植物根部细胞中,两者的关系是( )。
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共生
B.
寄生
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腐生
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【单选题】根瘤细菌生活在豆科植物根部细胞中 , 它们之间的关系是 ( ) 。
A.
寄生
B.
共生
C.
兼性寄生
D.
转主寄生
【单选题】根瘤细菌生活在豆科植物根部细胞中,两者的关系是()
A.
共生
B.
寄生
C.
腐生
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A.
正确
B.
错误
【简答题】根瘤细菌生活在豆科植物根部细胞中,两者的关系是()。
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