这种情况发生的最可能原因是
A.钙缺乏
B.蛋白质缺乏
C.铁缺乏
D.维生素D缺乏
E.锌缺乏
参考答案:E
On top of the hill ______, whose style can be traced to the ages of the Roman Empire.
A.there standing a church
B.does a church stand
C.a church stands
D.stands a church
作为蛋白质的氨基酸序列合成模板的是( )
A.tRNAB.mRNAC.rRNAD.snRNAE.scRNA