填空题

In Yugoslavia, the late 1960s and early 1970s were marked by improved relations with other countries, regardless of their political ______.(orient)

【参考答案】

orientation

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填空题

From 1948 to 1961, the proportion of American blacks earning less than $ 3000 a year declined from 78 to 47 percent; at the same time, blacks earning more than $ 10, 000 increased ______ from less than 1 to 17 percent. (proportion)

单项选择题

It can be inferred from the passage that the mathematical theory of games has been ______.

A．developed by scientists with an interest in genetics
B．useful in explaining some biological phenomena
C．adopted by Hamilton in his research
D．based on animal studies conducted prior to 1930

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