诊断缺铁最肯定的依据是
A．骨髓小粒可染铁消失B．小细胞低色素性贫血C．血清铁降低D．慢性失血史E．转铁蛋白饱和度降低
参考答案：A
I have P.E. ______ the afternoon of Tuesday. [ ]
A. in
B. at
C. on
D. for
猿啼
