单项选择题

It is implied that ______.

A．human beings will become less attractive in the future
B．less use of a bodily organ may lead to its degeneration
C．human beings hope for a change in the future life
D．future life is always predictable
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单项选择题
The change in man's size of forehead is probably because ______.
A．only 20 % of the brain's capacity is being made use of
B．his brain has grown larger over the past centuries
C．the other 80% of his brain will grow in due time
D．he will use his brain more and more as time goes on
单项选择题
What serves as the evidence that man is changing
A．Man has got stronger eyes now than he ever had.
B．Man's hair is getting thinner and thinner.
C．Man's arms and legs have become lighter and weaker.
D．Man has been growing taller over the past 500 years.
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