单项选择题

Plateau's experiments were the first steps leading to the invention of ______.

A．eyeglasses
B．telescopes
C．bifocals
D．motion pictures
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单项选择题
The word software , as used by the author, is close in meaning to a number of ______.
A．computers that the programs are in
B．programs that a computer simplifies
C．instructions that instruct a computer what to do
D．programs that tell a computer to give instructions
单项选择题
Many schools have bought computers for their students because of ______.
A．their wide variety
B．their wide use
C．the free choice of computers
D．the free choice of educational programs
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