单项选择题

Senta and Sam are both influenced by______.

A．the instructor's teaching ability
B．the professor's humorous stories
C．the grades that they are earning
D．the long assignments given
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单项选择题
Labor force is composed of______.
A．people who are available to work and earn income
B．self-employed people only
C．only those who are looking for an employment
D．only the employees
单项选择题
The population which is top-heavy with older people poses a problem to______.
A．the government
B．the economy
C．the workforce
D．all of the above
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