洋金花的主要化学成分为( )。
A.挥发油B.生物碱类成分C.黄酮类成分D.苷类成分E.鞣质类成分
参考答案:B
________ his spare time that his English has improved a lot.
A.So good use does he make of
B.Such good use does he make of
C.He makes very good use of
D.He makes so good use of
足月出生的新生儿体内铁的储备可预防4个月以内的铁缺乏。( )