女性，42岁，月经增多2年，乏力、面色苍白5个月，查体：贫血貌，巩膜无黄染，肝脾不大。既往体健，血象：白细胞3.6×10⁹／L，红细胞3.2×10¹²／L，Hb55g／L，MCV65fl，MCH20pg，血小板200×10⁹／L。

该患者首先考虑诊断（）

A.缺铁性贫血

B.阵发性睡眠性血红蛋白尿

C.恶性贫

D.失血性贫血

E.巨幼细胞性贫血

The World Health Organization considers smoke from dirty stoves to be one of the five most serious health risks that face people in poor, developing countries. Nearly 2 million people die from its effects each year, more than twice the number from malaria. And because the smoke contains greenhouse gasses such as carbon dioxide and methane, as well as black carbon, it contributes to climate change.