下图为甲、乙两种植物体细胞的染色体及基因分布示意图，由下图可知（）
A.甲、乙都是二倍体
B.甲是三倍体，乙是二倍体
C.甲是二倍体，乙是四倍体
D.甲是三倍体，乙是四倍体
参考答案：B
解析：试题分析：甲含有3个形态一样的染色体，故有3个染色体组，乙含有2个染色体组，如果它们都是受精卵发育而来的则甲是三倍体植株，乙是二倍体植株，故选B。如果都是直接由配子发育而来的都是单倍体。
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| Paris has a beautiful name, the City of 1 . Do you know 2 it means? Many beautiful buildings are lighted at 3 . The streets are very 4 . When you 5 in Paris, you must not turn 6 you headlights (汽车前 灯) even after dark. Paris is full of life all day and all night. But this is not the 7 reason for its beautiful name. For hundreds of years, Paris has been the centre of science and art. 8 scientists and artists have come to 9 here. For this reason also, people 10 it the City of Lights. | ||||
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