单项选择题

In Line 6, Para. 3, the author use the expression of "learn the hard way" to mean that

A．we try to reevaluate our previously held beliefs as we grow older.
B．we refute some moral principles only after we find them inconsistent.
C．we acquire a sense of right and wrong from our real life lessons.
D．we become mature through ignoring our inherited unselfish tendencies.

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单项选择题

In what way is ethics comparable to language usage

A．Both have rules to make the optimal choice under a circumstance.
B．Both vary according to the context they are applicable to,
C．Both are thought to be objective, not subjective, existence.
D．Both contain sets of rules applied in quite different conditions.

单项选择题

It can be inferred from the text that

A．certain areas in pure research are not fully explored.
B．applied investigation requires greater scientific ability.
C．applied research is inferior to pure research.
D．knowledge is useless unless it is put into practice.