单项选择题

______ helped them to live a better life than most people of that time.

A．The knowledge of time
B．The knowledge of tools
C．The knowledge of about nature and the world
D．The knowledge of numbers
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单项选择题
According to the passage, ______.
A．a good night's sleep helps your brain permanently file away lessons learned during the day.
B．the brain has to wait until the lights are out to begin processing those memories
C．perhaps it's safe for anyone to get plenty of sleep when it has not been proved unnecessary for memory
D．attracting the subjects doesn't affect their ability to store memories.
单项选择题
Which of the following sentences is true of tile tasks which volunteers are required to do
A．They learned to navigate a car and then searched for an object.
B．They learned how to navigate and then searched the town for an object.
C．They learned to predict when a sequence of dots would appear on a screen.
D．They learned to predict how a sequence of dots would appear on a screen.
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