单项选择题

How does the author indicate oncogenes

A．They are always in operation in a healthy person.
B．They remain unharmful so long as they are not activated.
C．They can be driven out of normal cells.
D．Normal cells can't turn them off.

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单项选择题

Which description is true about administrator

A．A "trained" man who is more a specialist than a generalist.
B．A man who sees the trees as well as the forest.
C．A man who is very strong in the humanities.
D．A man who is an "educated" specialist.

单项选择题

What kind of people does the society really need

A．All-round people in their own fields.
B．People whose job is to organize other people's work.
C．Generalists whose educational background is either technical or professional.
D．Specialists whose chief concern is to provide administrative guidance to others.