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
The study says the results are ______ with an earlier research, which showed improved survival of patients with advanced HIV perfection taking the medication.
A．persistent
B．consistent
C．compatible
D．harmonious
单项选择题
Three hours has passed since the discussion was begun, and I'm afraid they will ______ it still longer.
A．expand
B．stretch
C．protract
D．extend
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