单项选择题

A．The program received great support from the public.
B．The students have more interest ii1 and responsibility for their learning.
C．Philadelphia saved a lot of money through the program.
D．The students have a heavier load of homework to do every day.

A.The
B.
B．The
C.
C．Philadelphia
D.
D．The
E.

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万国邮联各项业务协定及实施细则，列有包括()以及它们的实施细则。

单项选择题

听力原文： A computer is a machine designed to perform. work mathematically and to store and select information that has been fed into it. It is run by either mechanical or electronic means. These machines can do a great deal of complicated work in a very short time. A large computer, for example, can add or subtract nine thousand times a second, multiply a thousand times a second, or divide five hundred times a second. Its percentage of error is about one in a billion digits. It has been estimated that human beings making calculations average about one mistake per two hundred digits. The heart of an electronic computer lies in its vacuum tubes, or transistors. Its electronic circuits work a thousand times faster than the nerve cells in the human brain. A problem that might take a human being two years to solve can be solved by a computer in one minute, but in order to work properly, a computer must be given instructions--it must be programmed. Computers can be designed for many specialized purposes--they can be used to prepare payrolls, guide airplane flights, direct traffic, even to play chess. Computers play an essential role in modern automation in many plants and factories throughout the world.(33)A．One in a billion digits.B．Zero.C．One mistake per two hundred digits.D．One in a million digits.

A.
B.
C.
(33)
A．One
D.
B．Zero.
C．One
E.
D．One
F.

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