71. The questions presented in the first paragraph ____.

1. seen to have no answers whatever
2. are intended to dig for ancient human minds
3. are not scientific enough to be answered here
4. are raised to explore the evolution of human appearance

72. The scientists find the proxy to be ____.

1. the role of culture
2. the passage of time
3. the structure of a skull
4. the biological makeup of the brain

73. According to Renfrew's paradox, the transition from 60 000 to 10 000 years age suggests that ____.

1. human civilization came too late
2. the hardware retained biologically static
3. it took so long for the software to evolve
4. there existed an interaction between gene and environment

74. From the example illustrating the relation between culture and biology, we might conclude that ____.

1. the mental development has not been exclusively biological
2. the brain and culture have not developed at the same pace
3. the theory of natural selection applies to human evolution
4. vitamin C contributes to the development of the brain

75. Speaking of the human mind, the author would say that ____.

1. its cognitive development is extremely slow
2. to know its past is to understand its future
3. its biological evolution is hard to predict
4. as the brain develops, so as the mind

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