单项选择题

What did children need to do in the earliest time mentioned by the speaker

A．They needed to count and calculate money.
B．They needed to read and write.
C．They needed to alert moving objects.
D．They needed to hunt and farm.
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单项选择题
What changed children' s need for formal schooling
A．There was a new dependence on communication with people far away and the use of money.
B．The alphabet and numerical system was introduced.
C．The old methods of farming now required the use of complex machines.
D．The global economy made mass electronic communication very common.
单项选择题
What causes differences in size and color of annual rings
A．The climate.
B．The exposure to light.
C．The length of time.
D．The fertility of the soil.
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