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【单选题】
下列有关被子植物种子和果实形成过程的说法中,正确的是( )A.
落在柱头上的花粉，萌发生出花粉管，每个花粉管中含有两个精子
B.
一个精子和一个卵细胞分别与两个极核受精的过程，叫双受精
C.
受精后，子房发育成果实，珠被发育成果皮
D.
受精后，胚珠发育成种子，受精卵发育成胚乳
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【简答题】承上题 ,在预借差旅费1000元后,出差回来报销差旅费600元。(平行记账)
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