单项选择题

To （）important dates in history, countries create special holidays.

A．commend
B．memorize
C．propagate
D．commemorate

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单项选择题

Doctors are often caught in a （）because they have to decide whether they should tell their patients the truth or not.

A．puzzle
B．perplexity
C．dilemma
D．bewilderment

单项选择题

While a full understanding of what causes the disease may be several years away, （）leading to a successful treatment could come much sooner.

A．a distinction
B．a breakthrough
C．an identification
D．an interpretation

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