2013
高考英语二轮专题复习（完形与阅读）天天练（20）及答案 完形填空 charles r. drew was a medical student at columbia university in new york. before he graduated, he wrote an article __26___ blood bank, that is, the storing of blood. up till then, a lot of people had died from loss of blood __27___ there was no blood bank. when the united states entered the second world war, it became __28___ to set up blood banks.
