题目内容
企业持有现金主要出于三种需求，这三种需求是交易性需求、预防性需求和收益性需求。 ()
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We judge race usually from the coloring of the skin: a white race, a brown race, a yellow race and a black race. But【52】you were to remove the skin you could not tell anything about the race to which the individual belonged. There is nothing in physical structure, the brain or the internal organs to【53】a difference.
There are four types of blood. All types are found in every race, and no type is distinct to any race. Human brains are the【54】No scientists could examine a brain and tell you the race to which the individual belonged. Brains will【55】in size, but this occurs within every race.【56】does size have anything to do with intelligence. The largest brain ever examined belonged to a person of weak【57】. On the other hand, some of our most distinguished people have had【58】brains.
Mental tests which are reasonably【59】show no differences in intelligence between races. High and low test results both can be recorded by different members of any race.【60】equal educational advantages, there will be no difference in average standings, either on account of race or geographical location.
(51)
听力原文：W: Nobody told me that the class was canceled today.
M: Yeah, sorry. I meant to, but I was SO busy that it slipped my mind.
Q: What does the man mean？
(17)
A person who is______typically has anxious thoughts and difficulty in concentration or remembering.
Who were the subjects of the IBD study？
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