单项选择题

A．By selling services that make life comfortable.
B．By selling land containing oil.
C．By selling public lands.
D．By selling coal and other natural products.
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单项选择题
A．Rising prices.B．Fixed income.C．Real income.D．Cost of living.
A．Rising prices.
B．Fixed income.
C．Real income.
D．Cost of living.
单项选择题
A．A system which trains doctors.B．A group of experts who can provide professional advice.C．A computer program which can provide professional advice.D．A system which trains computer experts.
A．A system which trains doctors.
B．A group of experts who can provide professional advice.
C．A computer program which can provide professional advice.
D．A system which trains computer experts.
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