胃酸的生理作用不包括 ()
A.激活胃蛋白酶原
B.杀灭进入胃内的细菌
C.促进胰液分泌
D.促进小肠对铁的吸收
E.促进维生素B12的吸收
参考答案:E
— ________ you tell me something about the earthquake in Japan?
— Sorry, I _________. I know nothing about it.
[ ]
A. Could, couldn't
B. Can, needn't
C. Could, can't
D. Can, mustn't
引起生理性贫血的因素是()
A.长期高原生活
B.妊娠剧烈呕吐
C.妊娠中、晚期
D.6个月~2岁的婴幼儿
E.老年人