取一段燕麦幼苗茎放在一定浓度的植物生长素水溶液中培养,结果如下图。幼苗茎段重量增加的主要原因是
A.水分增加
B.糖类增加
C.蛋白质增加
D.无机盐增加
答案:A
—Excuse me! Would you mind not smoking here?
—_______. It's a non-smoking area.
A. Yes.
B. Sorry. I'll put it out at once.
C. That's all right.
舌头对甜味最敏感的部位是()。