单项选择题

The （）side is that it costs jobs，with factories only demand for a small proportion of the workforce when operated conventionally.

A.ill
B.leaky
C.flop
D.flip

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（）are the earliest settlers in Britain.

A.Romans
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C.Iberians
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Who was the first American president that was compelled to resign？（）

A.Abraham Lincoln.
B.Thomas Pain.
C.John Adams.
D.Richard Nixon.