I ____ a poem last night. [ ]
A. wrote
B. writes
C. writing
答案:A
诊断妊娠期女性贫血的标准为血红蛋白浓度低于()
A.140g/L
B.130g/L
C.120g/L
D.110g/L
E.100g/L
简述教育在人的发展中的作用。