单项选择题

Student should evaluate their instructors______.

A．by discussing opinions with classmates
B．by rating the instructor's interest in students' problem
C．by discussing opinions with instructors
D．by rating instructor's humorous remarks

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单项选择题

The conclusion which can be drawn safely from the second paragraph is that______.

A．a population growth from natural increase leads to a greater proportion of the workforce
B．a large population does not necessarily mean a higher proportion of workforce
C．the larger the number of the aged in a population, the higher the proportion of the workforce
D．if the population has an evenly spread age distribution, the workforce will be lower

单项选择题

The factor which does NOT influence the size of the workforce is______.

A．the size of population
B．age distribution of the population
C．national economy
D．natural increase