单项选择题

All the useful energy at the surface of the earth comes （）

A．directly from the sun
B．from the sun' s activity
C．from energy stored by the sun
D．from radiation of the sun

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单项选择题
The oldest kind of computer, the abacus, has been used since （）

A．600
B．700
C．800
D．500
单项选择题
The computer will soon affect （）

A．people in large cities
B．people in developed countries
C．all humanity
D．the Western world
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