问题
单项选择题
已知A、B两点的标高分别为4.200m和4.500m，在水准测量中，如A点水准尺读数为d，则B点的读数为（）。
A.小于d；
B.大于d；
C.d－300；
D.d＋300。
答案
参考答案：C
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已知A、B两点的标高分别为4.200m和4.500m，在水准测量中，如A点水准尺读数为d，则B点的读数为（）。
A.小于d；
B.大于d；
C.d－300；
D.d＋300。
参考答案：C
Charles R. Drew was a medical student at Columbia University in New York. Before he graduated, he wrote an article __41___ blood bank, that is, the storing of blood. Up till then, a lot of people had died from loss of blood __42___ there was no blood bank. When the United States entered the Second World War, it became __43___ to set up blood banks. Dr Drew became __44___ of the Red Cross’s first blood bank. When the Red Cross __45___ blood banks to collect and store blood for men __46__ in battle, black American gave blood along with the whites. At ___47__ their blood was not accepted. Later blood from the blacks was ___48___ but was stored in a __49___ place from “white” blood. Although the best doctors __50___ that there was __51___ difference at all between the blood of blacks and whites, the Red Cross, with the support of the government, __52___ to separate black blood from white blood. After the war, Dr Drew was ___53__ from Washington with three other doctors to attend a medical meeting in a southern state. In northern Carolina their car went __54___ a ditch（深沟）and Dr Drew was __55___ hurt. He had lost __56__ blood by the time a passing car took him to the __57___ hospital. But they were stopped at the gate of the hospital. “__58__him to the hospital for blacks.” No matter __59___ they said, they could not get into the hospital. They had to take him to the __60___ hospital, but on the way Dr Drew died because he had lost too much blood.
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