A:瓣膜能防止血液的倒流
B:静脉血管中有静脉瓣
C:心房与心室之间有房室瓣
D:动脉血管中有动脉瓣
读短文,回答问题。
May: Good morning! Can I help you?
Lucy: Yes. I want some pencils and pens.
May: We have many here. Which one do you like?
Lucy: That red one, please.
May: Here you are.
Lucy: Thank you. How much is it?
May: It's cheap. It's 1 yuan.
— What time do you get home?
— At_______.