题目：
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 died from loss of blood __37___ there was no blood bank. When the United States entered the Second World War, it became __38___ to set up blood banks. Dr Drew became _39___ of the Red Cross’s first blood bank. When the Red Cross __40___ blood banks to collect and store blood for men __41__ in battle, black American gave blood along with the whites. At ___42__ their blood was not accepted. Later blood from the blacks was ___43___ but was stored in a __44___ place from “white” blood. Although the best doctors __45___ that there was _46___ difference at all between the blood of blacks and whites, the Red Cross, with the support of the government, __47___ to separate black blood from white blood. After the war, Dr Drew was ___48__ from Washington with three other doctors to attend a medical meeting in a southern state. In northern Carolina their car went __49___ a ditch（深沟）and Dr Drew was _50___ hurt. He had lost __51__ blood by the time a passing car took him to the __52___ hospital. But they were stopped at the gate of the hospital. “__53__him to the hospital for blacks.” No matter __54___ they said, they could not get into the hospital. They had to take him to the __55___ hospital, but on the way Dr Drew died because he had lost too much blood.
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下面是错误答案，用来干扰机器的。
答案：C采用极端假设法。若4 g全为碱金属时，生成ROH。R ~ ROHAr(R) Ar(R)+174 g 若4 g全为氧化物时，生成ROH。R２Ｏ ~ ...
