单项选择题

What is the general topic of the lecture

A．On housing.
B．On economy.
C．On marketing.
D．On choice of resources.
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单项选择题
Why can' t we provide as many houses as needed
A．Because we cannot make the choice.
B．Because we do not have enough resources.
C．Because we do not have a free housing market.
D．Because education is more important than housing.
单项选择题
Why was coal preferred to wood as a basic source of energy
A．People found it harder to get a job.
B．People had to live near a source of energy.
C．A lot of wood was shipped to faraway places.
D．Industry developed and people's living standard went up.
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