单项选择题

23（）

A．except
B．of
C．out of
D．among

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单项选择题

Many people believe that viruses cannot possibly be of importance in human cancer because （）

A．they are innocuous agencies
B．they are the causative agents of most human cancer
C．they seem to be infections to many people
D．they are generally thought to be relevant to most cancer in man

单项选择题

Times for movies and concerts are not listed in this announcement because （）.

A．a film or concert occurs every Wednesday at 7 p. m.
B．the full list would be too long
C．films and concerts cannot be announced publicly
D．the full list is not ready yet