单项选择题

A．To speak English.
B．To read technical books in English.
C．To listen to English programs on radio.
D．To read English literature.
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单项选择题
Two Australian billionaires have been placed on the waiting list for entering space as private passengers.
A．Y
B．N
C．NG
单项选择题
The 2003 survey reveals that ______.
A．hostile online attacks are still rampant
B．fighting online attacks is a never-ending battle
C．other elements than technology are at work for greater security
D．new operating systems should be updated constantly to fight viruses
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