单项选择题

For years he struggled （）as teacher, an agent and the president.

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

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In the museum, I saw a（）of an old warship.

A. miniature
B. mineral
C. minimum
D. minister
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Free medical treatment in this country covers sickness of mind as well as （）sicknesses.

A. normal
B. regular
C. average
D. ordinary
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