被子植物的生活史中雌配子体的第一个细胞为

题干

A：成熟胚囊

B：单核胚囊

C：胚囊母细胞

D：卵细胞

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听短文, 根据短文内容完成下列表格。

Things some people do on the __（1）____	they spend only ____（2）____.
	They ___（3）____ to give their seats to the old people without listening to the ticket sellers.
	Be ___（4）____ and help the persons in need of help.
Things we should do	Give your seats to the people with ____（5）____ and let old people get on or get off before you.