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 a type of insect.B．They are a kind of fish.C．They are a type of bird.D．They are a type of pig.
A．They are a type of insect.
B．They are a kind of fish.
C．They are a type of bird.
D．They are a type of pig.
单项选择题
A．At an art gallery.B．In a department store.C．At a bookstore.D．In a workshop.
A．At an art gallery.
B．In a department store.
C．At a bookstore.
D．In a workshop.
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