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 【21】______ phenomenon of race consists of a few surface indications.

We judge race usually 【22】______ the coloring of the skin: a white race, a brown race, a yellow race and a black race. But 【23】______ you were to remove the skin you could not 【24】______ anything about the race to which the individual belonged. There is 【25】______ in physical structure, the brain or the internal organs to 【26】______ a difference.

There are four types of blood. 【27】______ types are found in every race, and no type is distinct to any race. Human brains are the 【28】______ . No scientists could examine a brain and tell you the race to which the individual belonged. Brains will 【29】______ in size, but this occurs within every race. 【30】______ does size have anything to do with intelligence. The largest brain 【31】______ examined belonged to a person of weak 【32】______ .On the other hand, some of our most distinguished people have had 【33】______ brains.

Mental tests which are reasonably 【34】______ show no differences in intelligence between races. High and low test results both can be recorded by different members of any race. 【35】______ equal educational advantages, there will be no difference in average standings, either on account of race or geographical location. Individuals of every race 【36】______ civilization to go backward or forward. Training and education can change the response of a group of people, 【37】______ enable them to behave in a 【38】______ way.

The behavior. and ideals of people change according to circumstances, but they can always go back or go on to something new 【39】______ is better and higher than anything 【40】______ the past.

【21】

A．complete

B．full

C．total

D．whole