In Reading A "College pressures", four types of pressures are explained to tell readers the effects of pressure college students have. However, in the essay, two types of the pressures are explained in the same section, what are they?
【简答题】Charles R. Drew was a medical student at Columbia University in New York. Before he graduated, he wrote an article __36___ blood bank, that is, the storing of blood. Up till then, a lot of people had ...