玉米和高粱的穗状花序组成及分类单位为:()。
A.花
B.小穗
C.雄花
D.雌花
参考答案:B
--What a nice coat! I’ll take it.
--But you'd better _________ first. I’ m afraid it may be small for you.
A.try it on
B.pay for it
C.put it on
D.turn it on
尿毒症病人出现消化道症状的主要原因是
A.肾素活性增高
B.高磷低钙
C.水钠潴留
D.低蛋白血症
E.尿素经消化道排出