单项选择题

A．From the western United States.
B．From all parts of the country.
C．From only the east coast of the American Continent.
D．From San Francisco Bay.
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单项选择题
A．They are found under the oceans.B．They were most active when earth was first formed.C．Their emissions created earth’s atmosphere.D．Their fumes are mostly water in the state nfs gas.
A．They are found under the oceans.
B．They were most active when earth was first formed.
C．Their emissions created earth’s atmosphere.
D．Their fumes are mostly water in the state nfs gas.
单项选择题
A．An old friend of his.B．His elder brother.C．His younger brother.D．His younger son.
A．An old friend of his.
B．His elder brother.
C．His younger brother.
D．His younger son.
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