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
<上一题 目录 下一题>
热门 试题

单项选择题
After ______ seemed an endless wait, the arrogant superstar appeared onto the press conference.
A．it
B．that
C．what
D．which
单项选择题
The President was ______ by the directors as she toured the factory.
A．accompanied
B．attended
C．escorted
D．convoyed
相关试题