对能产生珠芽的种类，如卷丹和淡黄百合等在珠芽充分长大成熟而尚未脱落时采集，采下后立即栽植，当年可生根，第二年后形成（），2—3年后开花。
参考答案：小鳞茎
— She has gone abroad,______?
—No. She is still teaching us English at our school now.[ ]
A. is she
B. isn't she
C. has she
D. hasn't she
上消化道出血是指？
