________.
A.confirmed his assumption
B.speeded up his research process
C.disagreed with his assumption
D.changed his research objectives
64.Rothschild might have concluded that ichthyosaurs
________.
A.failed to evolve an anti-decompression means
B.gradually developed measures against the bends
C.died out because of large sharks and crocodiles
D.evolved all anti-decompression means but soon lost it
2017·辽宁卷] C
C
Here is an astonishing and significant fact: Mental work alone can't make us tired.It sounds absurd.But a few years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue(疲劳).To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day laborer, we would find it full of fatigue toxins(毒素) and fatigue products.But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.
So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours of effort as at the beginning.The brain is totally tireless.So what makes us tired?
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