单项选择题

（） developed the atomic theory in the 18th century.

A．Francis Glisson
B．John Dalton
C．Robert Boyle
D．Benjamin Franklin

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单项选择题
The longest river in Britain is （）.

A．the Severn
B．the Clyde
C．the Thames
D．the Tyne
单项选择题
Blues is a type of music of strong rhythm, which was originally sung by （）.

A．African Americans
B．American Indians
C．Welshmen
D．Scotsmen
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