单项选择题

The 18th century saw selective breeding of cattle, sheep and houses by _________.

A.Jethro
B.Thomas
C.George
D.Robert
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单项选择题
About 90 per cent of the state secondary school population in the UK attend _____.
A.independent
B.junior
C.independent
D.primary
单项选择题
In the following rivers，（）has been called the American Ruhr.

A.the Mississippi
B.the Missouri
C.the Hudson
D.the Ohio
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