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．They are an unexpected and unnatural disaster.B．They are an irreversible chemical production in waters.C．They are an unpreventable pollution to waters.D．They are an explosive, wild growth of aquatic organisms.
A．They are an unexpected and unnatural disaster.
B．They are an irreversible chemical production in waters.
C．They are an unpreventable pollution to waters.
D．They are an explosive, wild growth of aquatic organisms.
单项选择题
A．An examination of fanners in northern Japan.B．Tests given on a thousand old people.C．Examining the brain volumes of different people.D．Using computer technology.
A．An examination of fanners in northern Japan.
B．Tests given on a thousand old people.
C．Examining the brain volumes of different people.
D．Using computer technology.
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