下列关于物质运输的说法正确的是（）

A.钾离子主动运输进入细胞，对维持细胞内液渗透压起重要作用

B.尿液中的尿素含量远高于原尿中，是因为肾小管具有很强的分泌功能

C.糖醋蒜在腌制中慢慢具有糖醋味，是细胞主动吸收糖分子和乙酸分子的结果

D.紫甘蓝叶片被沸水烫后，水呈红色，是因为细胞中的色素主动运输出细胞外

A:What’S the date today
B:It’S June 16.
A:(16)Then it’S Dragon Boat Festival today, isn’t it
B:Yes. (17)
A:Did you have rice dumplings this morning
B:Sure. (18)
A:I didn’t.
B:What a pity! But I happen to have got somewith me. (19)
A:I’d love to. By the way, why do you call it Dragon Boat Festival
B:Because in China, people race dragon boats this day every year。
A:0h, I see. (20)
B:You are welcome.
A．We Chinese usually eat rice dumplings the day.
B．I hate eating rice dumplings.
C．Thank you for your rice dumpling.
D．I don’think so.
E．Would you like to have one
F．Already
G．How about you