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  3. During recent years we have heard much about "race": how this race does certain things and that race believes certain things and

During recent years we have heard much about "race": how this race does certain things and that race believes certain things and

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问题     During recent years we have heard much about "race": how this race does certain things and that race believes certain things and so on. Yet, the (1)_____ phenomenon of race consists of a few surface indications.
    We judge race usually (2)_____ the coloring of the skin: a white race, a brown race, a yellow race and a black race. But (3)_____ you were to remove the skin you could not (4)_____ anything about the race to which the individual belonged. There is (5)_____ in physical structure, the brain or the internal organs to (6)_____ a difference.
    There are four types of blood. (7)_____ types are found in every race, and no type is distinct to any race. Human brains are the (8)_____. No scientists could examine a brain and tell you the race to which the individual belonged. Brains win (9)_____ in size, but this occurs within every race. (10)_____ does size have anything to do with intelligence. The largest brain (11)_____ examined belonged to a person of weak (12)_____. On the other hand, some of our most distinguished people have had (13)_____ brains.
    Mental tests which are reasonably (14)_____ show no differences in intelligence between races. High and low test results both can be recorded by different members of any race. (15)_____ equal educational advantages, there will be no difference in average standings, either on account of race or geographical location. Individuals of every race (16)_____ civilization to go backward or forward. Training and education can change the response of groups of people, (17)_____ enable them to behave in a (18)_____ way.
    The behavior and ideals of people change according to circumstances, but they can always go back or go on to something new (19)_____ is better and higher than anything (20)_____ the past.

选项 A、since
B、if
C、as
D、while
答案B
解析 该句为虚拟语气结构，应该选择if，表示条件。其他三个选项不合语法。
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考研英语一

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