单项选择题

The speech "I Have a Dream" was delivered by______.

A．Abraham Lincoln
B．John F. Kennedy
C．George Washington
D．Martin Luther King, Jr.
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单项选择题
The Economist is one of the most important ______ in Britain.
A．quality newspapers
B．weekly reviews
C．daily newspapers
D．Sunday newspaper
单项选择题
It is implied in the third paragraph that______.
A．many more computer crimes go undetected than are discovered
B．the rapid increase of computer crimes is a troublesome problem
C．most computer criminals are smart enough to cover up their crimes
D．most computer criminals who are caught blame their bad luck
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