单项选择题

The journal contains a ______ on biological problems of the day.

A. seminar
B. lecture
C. symposium
D. syntheses

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单项选择题

The service was held to ______ the sacrifice of those who died in the war.

A. commemorate
B. memorize
C. remember
D. remind

单项选择题

For years he struggled ______ as a teacher, an agent and the president.

A. in turns
B. by turn
C. out of turn
D. on the turn

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