单项选择题

After two years he received the certificate of the college for ______ in chemistry.

A．proficiency
B．diversion
C．immersion
D．involvement
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单项选择题
The nurse asked the child to take off clothes, then she carefully ______ up the blood from the wounds and spread alcohol over it.
A．inhaled
B．scattered
C．extracted
D．sponged
单项选择题
Ladies and gentlemen should always act with great ______.
A．impulse
B．dignity
C．temperament
D．symmetry
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