【单选题】1岁患儿,母乳喂养,未加辅食,约2个月发现患儿活动少,不哭、不笑,面色蜡黄,表情呆滞,手及下肢颤抖。检查发现肝、脾增大,血红细胞1×1012/L,血红蛋白50g/L。 该患儿可能为:
【简答题】天然药物中含有的一些化学成分如生物碱、挥发油、强心苷、香豆素、黄酮等,具有一定生物活性,称为 ____________ ,是防病治病的物质基础。
【多选题】香豆素类化合物具有抗病毒、抗癌等多种生物活性,香豆素-3-羧酸可由水杨醛制备。 下列说法正确的是
D.
l mol水杨醛最多能与3 mol H 2 发生加成反应
【单选题】According to Rob Reiner, the year from zero to three is ______.
A.
a critical stage to develop human nerves
B.
extremely important for a person's development
C.
studied carefully for government to make policies
D.
worth more efforts in education than that in later years
【多选题】下列选项中,符合香豆素的生物活性的是
A.
低浓度可刺激植物发芽和生长作用;高浓度则抑制
B.
具有光敏作用,可引起皮肤色素沉着,补骨脂素可治白斑病
D.
平滑肌松弛作用——茵陈蒿中的滨蒿内酯,具有松弛平滑肌等作用
【单选题】According to Rob Behrens, the increase in complaints is likely to continue as long as______.
A.
we are living in a customer culture
B.
universities increase tuition fees
C.
students have to pay their tuition fees
D.
the level of unemployment keeps rising