单项选择题

A．They change color every 50 minutes.
B．They change color more quickly.
C．They change color more slowly.
D．They change color on the same schedule.
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单项选择题
While modern economic development requires more highly educated people,________.
A．50 percent of the college students are unable to finish their studies
B．professional training for high school graduates is of equal importance
C．the transition between college and work is still a hard job for many youth
D．job-related skills are not within the range of higher education
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