单项选择题

This type of apparatus can produce more than 40,000 blood ______ a day.

A．examples
B．models
C．samples
D．specimen
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单项选择题
A Dream of Red Chamber is said ______ into several languages ill the last decade.
A．to translate
B．to be translated
C．to have been translated
D．been translated
单项选择题
The President was ______ by the directors as she toured the factory.
A．accompanied
B．attended
C．escorted
D．convoyed
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